“Their” is a possessive pronoun that shows ownership or possession. For example:

• Their house is beautiful. (The house belongs to them.)
• Their dog is very friendly. (The dog belongs to them.)

“They’re” is a contraction of “they are.” It is used to combine the subject pronoun “they” and the verb “are” into one word. For example:

• They’re going to the store. (They are going to the store.)
• They’re having a party. (They are having a party.)

In general, “their” is a possessive pronoun that shows ownership or possession, while “they’re” is a contraction of “they are.”