The escape () function is responsible for coding a string to transfer the information from one computer to the other across a network.

For Example:

<script>
document.write(escape("Hello? How are you!"));
</script>

Output: Hello%3F%20How%20are%20you%21

The unescape() function is very important as it decodes the coded string.

It works in the following way. For example:

<script>
    document.write(unescape("Hello%3F%20How%20are%20you%21"));
</script>

Output: Hello? How are you!