A programmer is a person who writes code to create software applications, websites, or systems. They use programming languages like Python, Java, or C++ to communicate with computers and tell them what to do. Programmers solve problems by breaking them down into smaller tasks and writing instructions that the computer can follow. In addition to writing code, programmers often test and debug their work to ensure it runs smoothly. They may collaborate with other professionals, such as designers and project managers, to develop user-friendly products. Overall, programmers play a crucial role in the technology we use every day.