Bond For 2 Years

An appointment letter of an organisation for managerial grade mentions that employee resigning can not join any of their client company for the period of 2 years even after exit.
Can such clause be challenged in the court of law ?

Such clauses have no real legal value.
As a former employee you should respect intellectual rights and former employer trade secrets.

A Safe Haven for Your Money -
Those just entering the investment scene are usually able to grasp the concepts underlying stocks and bonds. Essentially, the difference can be summed up in one phrase: debt versus equity. That is, bonds represent debt and stocks represent equity ownership.