What is a 25 Delta call?

Excuse me, could you please explain to me what exactly is meant by a "25 Delta call" in the context of finance and cryptocurrency trading? I'm familiar with the general concept of options and delta as a measure of an option's sensitivity to changes in the underlying asset's price, but I'm unsure of how this specific term is applied. Could you provide a concise yet informative definition, perhaps with an example to illustrate its significance in practical trading scenarios? Thank you in advance for your clarification.