Tridion Content Manager(TCM) ships with VERSION CONTROL BUILT Within it.

TCM creates a new version whenever you save and close with any changes.

As a result you can track the changes and also compare the changes with the previous versions.

Cheers
Kishore Kumar.N

Tridion Content Manager is a place where all the content are managed. All the website building blocks are stored in publications.

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Kishore Kumar.N

Modular Templating truly separates the design, code and applications of templates into template building blocks. Together with native integration with market-leading design and development tools, (including Adobe Dreamweaver and Microsoft Visual Studio .NET), Modular Templating gives designers, developers and programmers much greater control over each aspect of their template design and code.  By combining and reusing template building blocks, Modular Templates can be assembled for a variety of uses

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Kishore Kumar.N

SDL Tridion’s strengths lie in multilingual/multi-site support using the product’s BluePrinting feature.
Tridion is a content management system basically designed for large enterprises. With the help of tridion a company can manage all facets of their communication such as storing Informations (documents, images, audio, and video), Design (templates for internet), Source-code (source-code of corporate applications), and Visitors (profiling and personification).

Please read the entire blog to have an idea of What is BLUE PRINTING in Tridion??

Cheers
Kishore Kumar.N