Composer is a dependency management tool for PHP. It allows developers to declare the libraries and packages that their project depends on, and then it installs and manages those dependencies in a consistent and reliable way.

With Composer, developers can easily add new packages to their project, update existing ones, and remove unused packages. Composer takes care of resolving dependencies and ensuring that each package is installed with its own set of dependencies.

Composer uses a configuration file called composer.json to define the dependencies for a project. This file lists the required packages, their versions, and any other constraints or requirements. When a developer runs the composer install command, Composer reads the composer.json file and downloads and installs the required packages into the project's vendor directory.

Composer is widely used in the PHP community and is considered a standard tool for managing dependencies in PHP projects.

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