What is a Transformer in artificial intelligence, and why is it the base of most modern AI models?

Transformer in Artificial Intelligence powers over 90% of modern AI models today. Introduced by researchers at Google in 2017, the Transformer architecture changed machine learning forever. It helps AI models understand context, analyze massive datasets, and predict words using probability. Large systems like ChatGPT rely on this design. Training uses trillions of text tokens and human feedback. That is why Transformer-based large language models dominate generative AI, search, and automation today.