The Foul Lines
The foul lines, often colored white or yellow, partially outline the field of play. They extend from the batter's box to the foul poles located deep into left field and right field. We'll learn more about the batter's box and foul poles later in this chapter.
The baselines are the straight lines in between each of the bases. The baselines between 1st base and 2nd base, and 2nd base and 3rd base are invisible and not marked on a baseball field. However, the baselines between home plate and 1st base, and 3rd base and home plate coincide with the foul line.