What is DSL internet?
DSL is a way to get the internet using telephone lines. It's faster than the old dial-up internet and you can use the phone at the same time.
DSL is one of the cheapest options for accessing the internet, but it's not available in many places. However, it's slower than cable or fiber internet, which might be better for more difficult things like streaming videos.
Many companies are not using DSL anymore and it can be hard to find new DSL service. But lots of people still use it because it's cheap and works well for basic internet needs like checking email.