Can you buy Crypto on ramp?

Excuse me, but I was wondering if I could clarify something about buying cryptocurrency on a ramp. Is it possible to purchase digital assets like Bitcoin or Ethereum through a ramp? I'm a bit new to this space and I've heard of ramps being used as a way to enter the cryptocurrency market, but I'm not entirely sure how it works. Could you explain the process to me? I'd appreciate it if you could keep the explanation as straightforward as possible. Thank you!