  The Cherenkov Telescope Array Observatory (CTAO) is a next-generation
ground-based gamma-ray observatory that will study the universe at very high
energy using atmospheric Cherenkov light. CTAO will comprise over 67 telescopes
of three different sizes, located in the northern and southern hemispheres.
Among these, the Medium-Sized Telescope (MST) will play a crucial role in
CTAO's observations, providing excellent sensitivity and angular resolution for
gamma rays in the energy range of 100 GeV to 5 TeV. The MST is based on a
modified single-mirror Davies-Cotton design, featuring a segmented mirror with
a diameter of 12 meters, a total reflective surface of 88 square meters, and a
focal length of 16 meters. It will cover an approximately 8-degree field of
view and be equipped with two different cameras: NectarCAM and FlashCam, at the
northern and southern CTAO sites, respectively. The MST's design is optimized
for efficient observation of extended sources, including supernova remnants and
pulsar wind nebulae, as well as the study of gamma-ray bursts and active
galactic nuclei. Currently, the MST is in the midst of production and testing
stages with the aim of being installed in 2025 for the CTAO Pathfinder project.
In this project, one MST telescope will be deployed at each CTAO site to
provide on-site experience with pre-production components. This approach
facilitates cost and risk reduction before starting serial production. This
contribution provides an overview of the current status and plans of the MST's
construction at both the northern and southern CTAO sites, as well as details
on the telescope and camera designs and their expected performance.
