Who makes GPUs for AI?

Could you please elaborate on the manufacturers who specialize in creating Graphics Processing Units (GPUs) for Artificial Intelligence (AI) applications? As the demand for AI-optimized hardware continues to grow, I'm curious to know which companies are leading the way in this technology space. Are there any specific brands or models that are preferred by AI developers and researchers? Additionally, what are some of the key features or specifications that make these GPUs stand out for AI tasks? Understanding the landscape of GPU manufacturers for AI would greatly benefit those seeking to build or enhance their AI capabilities.