Layout is the way data is layed out in a buffer object.
A layout where each element is seperated out into multiple buffers. XXX, YYY, ZZZ
A layout where each element is clustered into larger groups in one buffer. XXXYYYZZZ
A layout where each element is clustered into smaller groups in one buffer. XYZXYZXYZ
See Implementation
Layout is the way data is layed out in a buffer object.