Why do baseball teams play the same team on multiple dates?

Answer 1

Because of travel. Baseball teams in MLB are located all over the country. Being able to play three of four games in a row against the same team keeps the teams from having to travel more than they already do and saves the teams money.

Answer 2

Every team needs to play about 162 games. there's not 162 teams so they vs each other many times. but they also can be in different leagues like the Yankees are in American league wile the Red Sox are in the Major leagues.