A project manager is a professional in the field of project management

Project management

Project management is the discipline of planning, organizing, securing, and managing resources to achieve specific goals. A project is a temporary endeavor with a defined beginning and end , undertaken to meet unique goals and objectives, typically to bring about beneficial change or added value...

. Project managers can have the responsibility of the planning, execution, and closing of any project

Project

A project in business and science is typically defined as a collaborative enterprise, frequently involving research or design, that is carefully planned to achieve a particular aim. Projects can be further defined as temporary rather than permanent social systems that are constituted by teams...

, typically relating to construction industry, architecture

Architecture

Architecture is both the process and product of planning, designing and construction. Architectural works, in the material form of buildings, are often perceived as cultural and political symbols and as works of art...

, computer networking, telecommunications or software development

Software development

Software development is the development of a software product...

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Many other fields in the production, design and service industries also have project managers.
A project manager is the person responsible for accomplishing the stated project objectives.