The word "pose" has several meanings, depending on its context.
1) As a verb, to pose means to hold or place one's body in a particular position for a photograph or artwork. For example, "She posed for the portrait artist."
2) In grammar, to pose is to form questions using certain words as subjects. For instance, "The teacher asked them to pose questions about the lesson."
3) As an adjective, something that is difficult or problematic can be described as a "pose" - meaning it's challenging and requires thoughtful consideration. An example usage would be: "This question poses a real challenge for me."