Invisible characters are those that take up space but are not seen. They are mostly used to format text or add extra space between words or lines. There are different types of invisible characters, including:
Whitespace: This is the most common type of invisible character. It includes spaces, tabs, and newlines.
Zero-width characters: These characters take up no space but are still visible. They are used to mark the beginning or end of a line or paragraph, or to indicate a change in direction.
Invisible characters can be useful when you want to add extra space between words or lines without changing the meaning of the text. However, they can also make text difficult to read, so use them sparingly.