Grunfeld defense is a hyper modern opening and is very popular today. The main practicer of the defense is Peter Svidler . It's dynamic , aggressive , active action by black . Though black give away the center control to black out the first moves, will breakthrough the center with the move c5 later . The main line is Exchange variation , recently the Russian variation is very popular. There is also line with Na5 move by white (called Nadanian attack) , which aims to eliminate black's c5 move. Study the defense , which can give you the desired victory. Grunfeld is my Number 1 defense to 1.d4 .  Here are 2 long videos you can watch.

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