Can someone tell me?

What's the difference between ADSL and SDSL

ADSL is a DSL line that is mostly for low use. It has download speeds many times faster than its upload speeds. This is usually for simple tasks such as downloading and viewing webpages.

SDSL has upload speeds almost the same as its download speeds. This makes it optimal for gaming and servers of any type. Because the upload speed is high it is more expensive than ADSL.

Thanks for your answer

A = Asymmetric (different upload/download speeds)

S = Symetric (Same upload/download speeds)

ADSL = cheap
SDSL = expensive

Another differentiating factor between the two can be Home vs. Business use. The needs of the business can often justify the added expense of SDSL.