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A daughterboard or daughtercard is a circuit board meant to be an extension or "daughter" of a motherboard
Motherboard

A motherboard is the central printed circuit board in some complex electronic systems, such as modern personal computers. The motherboard is sometimes alternatively known as the mainboard, system board, or, on Apple Inc....
 (or 'mainboard'), or occasionally another card. In particular, daughterboards often have plugs, sockets, pins, connectors
Electrical connector

An electrical connector is a Electrical conductor for joining electrical circuits together. The connection may be temporary, as for portable equipment, or may require a tool for assembly and removal, or may be a permanent electrical joint between two wires or devices....
, or other attachments for other boards, which is what differentiates them from a standard expansion board such as for PCI
Peripheral Component Interconnect

The PCI Local Bus , or Conventional PCI, is a computer bus for attaching computer hardware in a computer. These devices can take either the form of an integrated circuit fitted onto the motherboard itself, called a planar device in the PCI specification or an expansion card that fits into a socket....
 or ISA
Industry Standard Architecture

Industry Standard Architecture was a computer bus standard for IBM compatible computers....
. In addition, daughterboards usually have only internal connections
Electrical connector

An electrical connector is a Electrical conductor for joining electrical circuits together. The connection may be temporary, as for portable equipment, or may require a tool for assembly and removal, or may be a permanent electrical joint between two wires or devices....
 within a computer
Computer

A computer is a machine that manipulates Data according to a list of Code .The first devices that resemble modern computers date to the mid-20th century , although the computer concept and various machines similar to computers existed earlier....
 or other electronic
Electronics

Electronics refers to the flow of charge through nonmetal electrical conductor , whereas electrical refers to the flow of charge through metal electrical conductor....
 device
Machine

A machine is any device that uses energy to perform some activity. In common usage, the meaning is that of a device having parts that perform or assist in performing any type of work....
 rather than any external ones, and usually access the motherboard directly rather than through a computer bus
Computer bus

In computer architecture, a bus is a subsystem that transfers data between computer components inside a computer or between computers. Each bus defines its set of connectors to physically plug devices, cards or cables together....
.

Daughterboards are sometimes used in computers in order to allow for expansion card
Expansion card

An expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard to add additional functionality to a computer system....
s to fit on their side (or upright), parallel
Parallel (geometry)

Parallelism is a term in geometry and in everyday life that refers to a property in Euclidean space of two or more line s or plane , or a combination of these....
 to the motherboard, usually to maintain a small or slim form factor
Form factor

Form factor may refer to:* Form factor or emissivity, the proportion of energy transmitted by that object which can be transferred to another object...
.






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A daughterboard or daughtercard is a circuit board meant to be an extension or "daughter" of a motherboard
Motherboard

A motherboard is the central printed circuit board in some complex electronic systems, such as modern personal computers. The motherboard is sometimes alternatively known as the mainboard, system board, or, on Apple Inc....
 (or 'mainboard'), or occasionally another card. In particular, daughterboards often have plugs, sockets, pins, connectors
Electrical connector

An electrical connector is a Electrical conductor for joining electrical circuits together. The connection may be temporary, as for portable equipment, or may require a tool for assembly and removal, or may be a permanent electrical joint between two wires or devices....
, or other attachments for other boards, which is what differentiates them from a standard expansion board such as for PCI
Peripheral Component Interconnect

The PCI Local Bus , or Conventional PCI, is a computer bus for attaching computer hardware in a computer. These devices can take either the form of an integrated circuit fitted onto the motherboard itself, called a planar device in the PCI specification or an expansion card that fits into a socket....
 or ISA
Industry Standard Architecture

Industry Standard Architecture was a computer bus standard for IBM compatible computers....
. In addition, daughterboards usually have only internal connections
Electrical connector

An electrical connector is a Electrical conductor for joining electrical circuits together. The connection may be temporary, as for portable equipment, or may require a tool for assembly and removal, or may be a permanent electrical joint between two wires or devices....
 within a computer
Computer

A computer is a machine that manipulates Data according to a list of Code .The first devices that resemble modern computers date to the mid-20th century , although the computer concept and various machines similar to computers existed earlier....
 or other electronic
Electronics

Electronics refers to the flow of charge through nonmetal electrical conductor , whereas electrical refers to the flow of charge through metal electrical conductor....
 device
Machine

A machine is any device that uses energy to perform some activity. In common usage, the meaning is that of a device having parts that perform or assist in performing any type of work....
 rather than any external ones, and usually access the motherboard directly rather than through a computer bus
Computer bus

In computer architecture, a bus is a subsystem that transfers data between computer components inside a computer or between computers. Each bus defines its set of connectors to physically plug devices, cards or cables together....
.

Daughterboards are sometimes used in computers in order to allow for expansion card
Expansion card

An expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard to add additional functionality to a computer system....
s to fit on their side (or upright), parallel
Parallel (geometry)

Parallelism is a term in geometry and in everyday life that refers to a property in Euclidean space of two or more line s or plane , or a combination of these....
 to the motherboard, usually to maintain a small or slim form factor
Form factor

Form factor may refer to:* Form factor or emissivity, the proportion of energy transmitted by that object which can be transferred to another object...
. In this case they can also be called riser boards, or risers. Daughterboards are also sometimes used to expand the basic functionality of an electronic device, such as when a certain model has features added to it and is released as a new or separate model. Rather than redesign the first model completely, a daughterboard may be added to a special port
Computer port (hardware)

In computer hardware, a 'port' serves as an interface between the computer and other computers or peripheral devices. Physically, a port is a specialized outlet on a piece of equipment to which a Electrical connector or cable connects....
 or connector on the motherboard or mainboard. These usually fit on top of and parallel to the board, separated by spacer
Spacer

A spacer is generally something used to create a space between two objects, often to properly position them.There are also a number of specialised usages for the term....
s or standoffs, and are therefore sometimes called mezzanine cards due to being stacked like the mezzanine
Mezzanine (architecture)

In architecture, a mezzanine or entresol is an intermediate floor between main floors of a building, and therefore typically not counted among the overall floors of a building....
 of a theatre
Theatre

Theatre is the branch of the performing arts defined by Bernard Beckerman as what "occurs when one or more actor, isolated in time and/or Theater , present themselves to Audience." By this broad definition, theatre has existed since the dawn of man, as a result of human tendency for story telling....
. Wavetable cards are often mount
Mount

Mount may refer to:...
ed on sound card
Sound card

A sound card is a computer expansion card that facilitates the input and output of sound to/from a computer under control of computer programs....
s in this manner.

Use of the names daughter card and daughter board, and even mezzanine board are also acceptable.

See also

  • Creative Wave Blaster
    Creative Wave Blaster

    The Wave Blaster port is an internal connector / header on some sound cards from the 1990s that allowed sample-based synthesis Musical Instrument Digital Interface playback capability to be added to sound cards....