Camel with ActiveMQ

Hi,

I have a good understanding of ActiveMQ. I am apache exploring camel to
extend the use of ActiveMQ. I was reading the basic articles and websites.
Just stuck with some questions:

1. Does camel need ActiveMQ broker to run or it can work without ActiveMQ
also ?

2. What are the possible use cases where I can use camel with ActiveMQ ?

3. What is component ? After reading
http://activemq.apache.org/broker-camel-component.html
Is it like broker in camel or camel in broker?

Thanks,
Anuj