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Visualizations can help us understand how data structures and algorithms work. 

The visualgo.net website provides great visualization and animations on advanced algorithms. Most of them are discussed in 'Competitive Programming', co-authored by two brothers Dr Steven Halim and Dr Felix Halim. Today, some of these advanced algorithms visualization/animation can only be found in VisuAlgo. 

An online quiz system has been added that allows students to test their knowledge of basic data structures and algorithms. It generates questions and check the student answers automatically.