A Kandeel is a lantern

Lantern

A lantern is a portable lighting device or mounted light fixture used to illuminate broad areas. Lanterns may also be used for signaling, as 'torches', or as general light sources outdoors . Low light level varieties are used for decoration. The term "lantern" is also used more generically to...

 with a wooden framework and covered in coloured matte or glossy papers. These lanterns are generally hung in front of homes during the Hindu

Hindu

Hindu refers to an identity associated with the philosophical, religious and cultural systems that are indigenous to the Indian subcontinent. As used in the Constitution of India, the word "Hindu" is also attributed to all persons professing any Indian religion...

 festival of lights Diwali

Diwali

Diwali or DeepavaliThe name of the festival in various regional languages include:, , , , , , , , , , , , , popularly known as the "festival of lights," is a festival celebrated between mid-October and mid-December for different reasons...

. Kandeel in Sanskrit

Sanskrit

Sanskrit , is a historical Indo-Aryan language and the primary liturgical language of Hinduism, Jainism and Buddhism.Buddhism: besides Pali, see Buddhist Hybrid Sanskrit Today, it is listed as one of the 22 scheduled languages of India and is an official language of the state of Uttarakhand...

 is known as Akasha Deepa (lantern of the sky) and in Kannada

Kannada language

Kannada or , is a language spoken in India predominantly in the state of Karnataka. Kannada, whose native speakers are called Kannadigas and number roughly 50 million, is one of the 30 most spoken languages in the world...

, Goodu Deepa (Nested light), or Nakshatra Gudu(Star like nest).
Hindus in earlier days set Kandeels afloat high, a gesture to invite the spirits of their ancestors moving around to come back home and be with them during the festival time. Hence the name AkashaDeepa (lantern of the sky).
Kandeels are hung for around a month from the first day of Diwali. Kandeels are traditionally built in a crystal shape with tails at the bottom. In recent times, creativity has given way to different shapes such as stars, globes and airplanes. Opaque papers cut into a complex design give more beauty to a Kandeel by blocking some of the light behind it.