What is the confict, the protagonist, antagonist, and the theme of a story?

Since you didn't indicate a specific story, I can't give
you specific answers.

In general terms, definitions for the
terms you listed are:

The conflict is the reason for the
story. There is a problem to be solved, a disagreement between characters, a challenge
to be overcome. The situation that is the basis for the action is the
conflict.

The protagonist is the lead or most important
character of the story, frequently but not always the hero/heroine. The antagonist is
another major character, but is working against the protagonist.  This may mean one
person (protagonist) actively fighting against another person (antagonist) or it may
mean one character fighting against something else. In Moby Dick,
protagonist Captain Ahab is fighting an antagonist great white
whale.

The theme of any story is the main idea of the
story. Sometimes the theme is a message that is being illustrated or conveyed through
the telling of the story.