Often, there is no difference. We might be more likely to use someone if we had in mind a specific person.Originally Posted by sasha williams
- A: I met someone at a party yesterday, and I am trying to remember her name.
B: Can you tell me what she looks like?
A: She's blonde with blue eyes.
B: That's not much to go on.
A: She's a singer. She sings at this club.
A: That's it!
- A: I'm looking for someone.
B: Who are you looking for?
A: I'm looking for my wife.
Often they are interchangeable, but sometimes they are used differently. For example, a somebody is an important person (as opposed to a nobody) For example: "He's a somebody.
I hope that helps.