  This paper will review the origins, development, and examples of new versions
of Micro-Pattern Gas Detectors. The goal for MPGD development was the creation
of detectors that could cost-effectively cover large areas while offering
excellent position and timing resolution, and the ability to operate at high
incident particle rates. The early MPGD developments culminated in the
formation of the RD51 collaboration which has become the critical organization
for the promotion of MPGDs and all aspects of their production,
characterization, simulation, and uses in an expanding array of experimental
configurations. For the Snowmass 2021 study, a number of Letters of Interest
were received that illustrate ongoing developments and expansion of the use of
MPGDs. In this paper, we highlight high precision timing, high rate
application, trigger capability expansion of the SRS readout system, and a
structure designed for low ion backflow.
