What is the difference between first-person point of view and third-person point of view?

In first-person point of view, different characters talk. In third-person point of view, the main character talks.
In first-person point of view, the first character tells the story. In third-person point of view, the third character tells the story.
In first-person point of view, the narrator is inside the story. In third-person point of view, the narrator is outside of the story.
In first-person point of view, the word "I" is used. In third-person point of view, the word "we" is used.