Maverick wrote:
I don't know what the offical name for this is.

These floors were common here in the 1950's and 60's on porches, in
beach and lake houses. I have tried doing web searches but I keep
getting articles and questions related to a floor or tile that has
cracked. Years ago I found some info on DIY for these floors with
contrasting advice. One site said it was relatively simple another that
it really required a professional. I would appreciate any information
about how these are made , any web sites and pictures. The ones I have
seen usually have terracotta and tan colored tiles. Does anyone have
any pictures of floors done with white and cream colors, various
colored tiles or patterns ? Sometimes different types of tiles are
used, and sometimes hole and broken tiles are used together.

These floors seem to have held up well in the beach houses here built
in the 50's . I am wondering why they fell out of favor.

Were these inexpensive to install when they were common ?

Are you talking about "mosaic tile", or am I totally misreading the question?