Ik basically means "I know" in a shorter way.
Bob/Dad: Make sure you bring your pepper spray
Betty/Daughter: Ik, I'll be safe.
this is a slang used by the two latest generation- GenZ and Gen alpha, in texts.
It means 'I know' which is a comment for telling the other person that the speaker understands about what the other person said.
Linda: I heard Millie is going to shift.
Jeff: IK.
ik is a short usage for i know
ik its demon slayer
‘I’ in Dutch
Ben: Wie is Alex? (Who is Alex?)
Alex: Dat ben ik! (That’s me!)