Automatical deploying to Glassfish

I have a question about the automatically deploying from Eclipse to Glassfish. When I add the project 开发者_运维知识库to Glassfish I can choose whether or not to automatically deploy it. When I have the setting on and save a file I am working on the file is deployed. Is this a plugin or is it something Eclipse and Glassfish has a default option? I am new to the Java EE 6 and Maven.. And it isn't Maven that does this?

It is done by Glassfish Tool for Eclipse, which is an Eclipse Plugin. The tool doesn't include Glassfish Runtime, one have to install that separately.