What are GTO satellites used for?

Could you please explain in detail what GTO satellites are primarily utilized for? I'm particularly interested in understanding the specific functions and purposes they serve within the broader context of space technology and its applications. Are there any unique advantages or capabilities that make GTO satellites particularly suited for certain tasks or missions? Additionally, how do they compare to other types of satellites, and what are some of the key factors that determine when a GTO satellite might be the most appropriate choice?