What are different what are the different engine types and classifications?

Engines can be classified based on various criteria, including the type of fuel used, the method of operation, and the engine cycle. Common engine types include internal combustion engines (e.g., gasoline and diesel engines), external combustion engines (e.g., steam engines), and electric engines. Additionally, they can be categorized by their cycle, such as two-stroke and four-stroke engines, or by design, like rotary or reciprocating engines. Each classification serves specific applications, from automotive to industrial and aerospace uses.