explain me about the rear suspension of mountain bike.
closed as too broad by Gary.Ray♦ Mar 10 '14 at 12:58
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Here is a very rough answer to your very generic and open ended question:
A rear suspension (or shock), together with the front suspension (fork), allows the bike to handle more terrain roughness. This gives you:
The main two types of rear suspensions are:
Generally air suspensions are lighter and better for XC, all mountain, enduro. Coil shocks are heavier, more linear and better for downhill. See What's the difference between All-Mountain, Cross Country, Freeride, Downhill bikes? for a reference on mountain bike types.