Eclipse >> General >> Project builders and natures
>> Builder: take raw materials (workspace resources) and produce some output (workspace resources) based on those materials
>> Incremental After the first build, subsequent builds should only rebuild based on what has changed (delta) since the last build.
>> Project - A builder operates on the resources in a single project in the Eclipse workspace
Source: http://www.eclipse.org/articles/Article-Builders/builders.html