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Build configurations are styles of build that we will discuss here. There are at least two important build configurations you should know about: Debug and Release. The Build configuration that's currently selected is at the top of the editor, just below the toolbar in the default position:

Depending on which configuration you select, different compiler options are used. A Debug configuration typically includes extensive debug information in the build, as well as the ability to turn off optimizations to speed up compilation. Release builds are often optimized (either for size or for speed) and take a bit longer to build; they result in smaller or faster executables. Stepping through a file's behavior by moving through with the debugger line by line is often better in the Debug mode than the Release mode.