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An "installer" is a computer program that automates the process of installing software onto a computer. It copies files to the correct locations, sets up system configurations, registers the program with the operating system, and creates shortcuts, ensuring the software is ready for use. Installers also handle other tasks like managing updates, providing rollback options, and allowing for user customization during setup.

What an installer does

Copies and places files: It moves the necessary program files from the source (like a CD, USB drive, or download) to the computer's designated folders.

Configures the system: It performs actions like updating the system's registry, setting up file associations, and configuring security permissions.

Creates shortcuts: It often adds icons to the desktop or Start menu to make the new program easy to find.

Registers the software: This step is crucial for many operating systems, as it tells the OS where to find the program's components, which also allows for easier uninstallation later.

Handles dependencies: It can check for and install any other required software (like .NET Framework or Visual C++) that the program needs to run.

Provides customization: It may present a "custom setup" option, allowing users to choose which components to install or where to install them.

Manages post-installation tasks: After the main installation, it may launch the new application or delete temporary installation files.