What does it mean when a noun has's added to the end?

Answer 1

When a noun ends with -'s (or for some plural nouns that already end with an -s, just an apostrophe added at the end) means that something in the sentence belongs to that noun. That form is called a possessive noun. Examples:

• the car of my mother = my mother's car
• the teacher of our class = our class's teacher
• the coats of the children = the children's coats
• the covers of the books = the books' covers
• the meeting of the bosses = the bosses' meeting

Answer 2

Adding 's to a noun typically signifies possession or belonging to the noun. For example, "John's car" means the car belongs to John. It can also indicate a contraction for "is" or "has" in some cases, like "She's happy" for "She is happy."