An Output Stream is a component in computer programming that allows data to be sent from a program to an external destination, such as a file, network, or display. It is part of the broader concept of streams, which are sequences of data elements made available over time. Output streams can handle various data types, including text and binary data, and are essential for tasks like saving files or sending information over the internet. In many programming languages, such as Java or Python, output streams are implemented through specific classes or functions. For example, in Java, the `OutputStream` class provides methods to write data, while in Python, the `print()` function can be used to send output to the console. Understanding output streams is crucial for effective data handling and communication in software development.