What exactly do people mean now by "Free Palestine"?

I'm relatively new to the topic of the Israel-Palestine conflict.

What I know is that nothing happened for 2 years, then terrorists from Gaza came to Israel and killed/captured a lot of people, then Israel answered with bombs and a lot of people all over the world went out to the streets supporting Gaza.

How can it be? I can't believe that a huge part of the world supports terrorists, so it should be something else. But I don't understand, what exactly. People with the "Free Palestine" message, can you please explain your opinion?

What exactly do people mean now by Free Palestine?
What exactly do people mean now by "Free Palestine"?
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