Exactly. Buddha is a title, reflecting a state or condition of enlightenment, not an individual. There have been throughout history, and will be in the future, many Buddhas. Your confusion is very common, and entirely understandable. Buddhists very often informally use "Buddha" without qualification to refer to Siddhartha Gautama, the founder of Buddhism, as if that were his name. In English it better to refer to him with the definite article as the Buddha, or as the Lord Buddha.