@Joshua_Ong, yes, Adobe Lightroom and RAWTherapee offer similar functions — Non-destructive editing of RAW files.
One of the main differences is that Lightroom is made to be easy to use. It’s tools are all laid out in a sequential way, in the order that most people would use them.
RAWTherapee on the other hand aims to cover all the bases. There is often more than one way to do certain edits. Different algorithms give different results, depending on the situation. Consequently, RT has every tool they can think of. While that’s great, it does make it very confusing for a new user who is trying to figure out how to do a basic adjustment to a RAW file.