I got it.
I understand.
I see.
All right.

Are these expressions similar?

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Yes they are similar, although I would say “alright” is the most different one of the group. Like “alright” can be used for other things to, and it isn’t really like saying “I got it”, I mean it can be, but typically, you would say “alright, I get it” or something like that, like “alright” is just the thing that introduces the rest of you saying that you understand something.
Although of course, it depends on context, like if someone said “hey, can you go get me the meat from the freezer? It’s on the left hand side.” You could respond with just “alright” to say that you understand and that you will do it. But you could also respond with like “alright, yeah, I can do that.”