SOL is a short form for the School of Open Learning at Delhi University. It offers admission in different UG and PG courses offered by the DU colleges. The major difference between DU and SOL is that you don’t have to attend regular college.
Here are the other differences between DU and SOL.
If you are interested in SOL then you can go ahead and take admission in it; if you are working or due to other reasons you are not able to pursue your PG in a regular manner. For this, the SOL assists you with study material as well.