Encode means to change something into a programming code. For instance, changing a letter into the binary code for that letter or changing an analog sound into a digital file. A good example of where you are most likely to encounter encoding is what happens in your browser. The URL only supports so many characters, any other characters such as a space must be encoded to be understood. For example, if we wanted to have "computer hope" in the URL with the space it would be encoded to "computer%20hope".