What is the basic idea behind the SHGs for the poor?

What is the basic idea behind the SHGs for the poor? Explain in your own words.

The basic idea behind formation of SHGs is to create self-employment for the poor, particularly rural poor women. The SHGs help poor borrowers to overcome the problem of lack of collateral.
They can get timely loans for a variety of purposes at a reasonable interest rate in the name of the SHG of which they are members. The SHGs are thus the building blocks of organisation of the rural poor.