Matboard is an integral part of framing. For appropriate framing, it is better to add a mat board.
Your home is completely different from a museum. The purpose why both structures were built differs.
The right way for you to understand picture frame dimensions is by having full clarity on it so that you can be able to handpick the right size of frame for your artwork without stress.
It is not only 2D artwork that can be framed. Three-dimensional (3D) objects such as flower bouquets, medals, pieces of porcelain, sports memorabilia, and even jewelry can also be framed.