Why is "al" used when saying "los muchachos juegan al beisbol"?

I understand al is a conjunction for a el. What I'm confused on is

Los muchachos juegan al beisbol translates to

The boys play baseball.

If I wanted to just translate The boys play baseball I would think to say Los muchachos juegan beisbol. So why add the al?

submitted by /u/thecoderboy
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