The term "complex" refers to something that is made up of many interconnected parts, making it difficult to understand or analyze. For example, a computer system can be considered complex due to its various components, such as hardware, software, and networks, all working together to perform tasks. In contrast, "complicated" describes a situation or problem that is difficult to solve or figure out, often due to its intricate nature. A mathematical equation can be complicated if it involves multiple variables and operations, requiring careful thought and problem-solving skills to arrive at the correct answer.