Well Madge gave it to her in the book for good luck. But in the movie Greasy Sae gave it to her to give to Prim who eventually gave it back to Katniss.
Prim, Katniss's sister. She gave it to her because she wanted Prim to have it in case she died in the games.
Well if you can't pin the mocking jay pin on, then there's your answer.
Mockingjay is the third book in the hunger games trilogy. Katniss is the main character in all the books. The story is about her and the rebels defeating the Capitol. Seriously, have you even read the books?
Mockingjay's are first mentioned when Madge gives Katniss the Mockingjay pin.
In the book, Katniss doesn't give Prim the mockingjay pin. Madge, the Mayor's daughter gives the pin to Katniss after the reaping. In the movie, Katniss says "I got this for you today" and hands her the pin, then proceeds to say "as long as you wear it nothing bad will happen" as prim is scared for the reaping.
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She had given it to Prim in the beginning but Prim gave it back afterwards. After that, it never mentions Katniss giving it to anyone elde :)
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Katniss promises her that she will wear the mockingjay pin durung The Hunger Games.
I'll try to answer this without ruining Catching Fire & Mockingjay if you haven't read them already, but it'll be quite hard. Ok, so the mockingjay pin stands for good luck, and is meant to keep you safe, but Katniss, without realizing makes it more. The mockingjay pin turns into the sign of Panem's rebellion and Katniss is the face of the rebellion. Hope this helps :)
It is a mockingjay pin with the hunger games written on top you'll know what a mockingjay is when you start reading