REBOL Dialects are mini languages that are not handled by the normal REBOL interpreter, but by an interpreter written in REBOL. This allows programmers to write very efficient solutions for specific problems. The most prominent example is the Visual Interface Dialect included with REBOL/View.
Note that "dialect" has a specific meaning in REBOL - it does not refer to dialects in the same sense that C++ is a dialect of C or that VisualBasoc is a dialect of BASIC.
Links to information about REBOL Dialects should be submitted here, except for the Visual Interface Dialect which should be submitted under the REBOL/View category.