The basic idea of Subversion is that the source code and revisions are kept in a repository on a server. Users connect to the repository by using a client program, which allows the user to check out, view, edit, patch, and commit changes to the source code files (depending on the client’s permission level; in the WordPress project, only a couple of people have permission to commit changes to the repository).
Mercurial is a version control system (VCS), and importantly, it is a distributed version control system (a DVCS). Version control systems (both centralized or distributed) play an important role in project management for software development. They are used for managing and tracking all changes made during the development. Mercurial is also sometimes used for tracking documents and other files, but we’ll focus on software development in the following.
It is a free, distributed source control management tool. It efficiently handles projects of any size and offers an easy and intuitive interface.

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Features of Mercurial:

• It is fast and powerful.
• It is easy to learn.
• Distributed architecture.
• Platform independent.
• linear history according to a particular repository.