That’s a contraction. In English, plural words don’t use ’ (apostrophe).
English uses apostrophe in contractions like don’t, won’t, he’s, she’s, isn’t, they’re, we’ve etc. Here, ’ stands in for one or more letters which we slur together in spoken English.
Apostrophe is also used in English for possessive. This includes “the cat’s salami”, “Bob’s burgers”, “the computer’s hard drive” etc.
's shouldn’t be used for plural words. We write “five cats” not “five cat’s”. Likewise we would write “five bros” not “five bro’s”.
One common, but incorrect, usage of 's for plural is when people talk about decades. If I’m talking about a whole decade the correct form is “the 2000s were a time characterized by the rise of reality TV”. However, many people incorrectly write 2000’s. The apostrophe is unneeded. In contrast, writing “2001’s NYC terrorist attack” is correct because the terrorist attack belongs to that year.
