The Date and Time API is a programming interface that allows developers to work with dates and times in their applications. It provides functions to create, manipulate, and format date and time values, making it easier to handle time zones, durations, and calendar calculations. This API is essential for applications that require accurate timekeeping and scheduling. Many programming languages, such as Java and JavaScript, offer their own versions of the Date and Time API. These APIs help ensure that developers can manage time-related data consistently and efficiently, improving the overall functionality of software applications.