Stress Testing an AWS Web Application

My company needs to do some stress testing and simulates hundreds of connections at the same time on our web application.

Our back-end is in Java, and hosted on AWS BeanStalk service. I wanted to know if we can simulates connection on our own, or does AWS have a special tools to simulate connection ?

I saw Stress Testing vs Load Testing too, I can't tell the difference yet between those. If someone have an answer, feel free to help me as I'm quite struggling here...

Thank you !