In baseball, a contact hitter is a hitter who does not strike out often. Thus, they are usually able to use their bat to make contact with the ball (hence the name contact hitter) to put it in play, and then run fast to reach base. As a result of their focus on putting the ball in play, they usually have fewer home runs than power hitters, but a higher BABIP.
Tony Gwynn is a leading example of a modern contact hitter. With just 135 career home runs, Gwynn described himself as a contact hitter who could hit to all fields. He rarely struck out (just 434 times, once every 21 at-bats) and his goal was to put the ball in play and move baserunners over. Gwynn's success as a contact hitter landed him in the National Baseball Hall of Fame. Rod Carew is another example of a contact hitter who turned into a dominant MLB player, notching 18 all-star game appearances throughout his hall of fame career.