Code completion, also known as auto-completion, is a feature in an IDE that suggests possible code elements (such as variable names, functions, or classes) as the developer types. This feature helps speed up coding by reducing the amount of typing required and minimizing the likelihood of typos. It also makes coding more efficient, especially for large projects where remembering every variable or function name might be difficult. Code completion is context-aware, meaning it suggests options based on the code already written. This not only improves speed but also reduces errors, as it helps developers quickly identify the correct syntax and structure.