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