A build is a process that derives new resources from existing ones, updates existing resources, or both. 

In the Workbench, different builders are invoked for different types of projects. For example, when a build is triggered for a Java project, a Java builder converts each Java source file (.java files) into one or more executable class files (.class files). Builders usually enforce the constraints of some domain. For example, a Web link builder could update links to files whose name/location changes.

There are two kinds of builds: 

Incremental and clean builds can be done over a specific set of projects or the workspace as a whole. Specific files and folders cannot be built. There are two ways that builds can be performed:

Related concepts
External tools

Related tasks
Building resources
Performing builds manually
Performing builds automatically
Saving resources automatically before a manual build
Changing build order