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Galaxy clusters are the largest gravitationally bound structures in the Universe, and they provide valuable insights into astrophysics and cosmology. One method of studying galaxy clusters - the Sunyaev-Zel'dovich Effect - involves using the Cosmic Microwave Background (CMB) as a backlight. As CMB photons pass through the hot electron gas of the intracluster medium, a small portion are scattered and gain energy. This causes a distortion in the spectrum of the CMB which depends mainly on the total mass of the galaxy cluster and is independent of redshift, making it an important means of probing high-redshift systems. Only recently have telescopes become sensitive enough to detect the Sunyaev-Zel'dovich effect for low masses. In this thesis, we discuss the work done using the Sunyaev-Zel'dovich effect to study low-mass galaxy clusters and to identify new galaxy clusters in CMB maps.