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    <p>There's a nice explanation about the main differences between VCS based on changesets and on snapshots at <a href="http://sourcefrog.net/weblog/software/vc/derivatives.html" rel="noreferrer">Martin's blog</a>. I'll not repeat it here.</p> <p>However, I would stress one point that may not be obvious at first. Changeset based VCSs make it really easy to track merges, which is much more difficult for systems like Subversion, which is based on snapshots.</p> <p>In a changeset based VCS, merges are simply changesets (or commits, as they're called in git) which have more than one parent changeset. The graphical representation of the repository usually shows a DAG (Directed acyclic graph) where the nodes represent changesets and the arrows represent parent-child relationships. When you see a node with more than one parent you know exactly what kind of merge occurred there.</p> <p>In Subversion, "merge tracking" is something new. Up until version 1.4 there was no such concept, so that in order to know about the history of merges you had to make notes in the log messages of your commits. Version 1.5 implemented merge tracking to make it easier to perform repeated merges from one branch to another without forcing the user to be explicit about revision ranges and the like. This is implemented with a property (svn:mergeinfo) associated with the directory receiving the merge. It tracks which revisions have been already merged from which branches. This is enough to infer which revisions should be merged in subsequente merges. But it doesn't make it easy to draw graphs showing the merge history, which is something you would like to see frequently as you work in a complex project with several developers.</p>
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    1. COWelcome to stackoverflow, Gnustavo. Thanks for your great answer
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