What is meant by data output streams in programming?

Output streams in programming are an abstraction that allows data to be sent from a program to an external device or resource, such as a file, screen, or network.

In Java, output streams are represented by classes that allow writing bytes or characters sequentially. They provide a convenient interface for writing data without needing to work directly with devices.

Example of using an output stream to write text to a file:

try (FileOutputStream fos = new FileOutputStream("output.txt")) {
    String text = "Data output example";
    byte[] bytes = text.getBytes();
    fos.write(bytes);
} catch (IOException e) {
    e.printStackTrace();
}

Here, FileOutputStream is a byte output stream that writes data to a file.