Some characters have a specific meaning on the Internet. For example, characters like "?" or "&" may be used in the URL addresses. Characters like "<" or ">" are used in HTML code. If you want to use these characters in URL addresses, you must enter them in a way that will not be interpreted as part of URL. For example, the "<" character must be written as "%3c".
What is a number after "%"? This is the numeric value of the character in the ASCII table. This value is written in hexadecimal form, which means two digits 00-FF. Even the "%" character itself can be written as "%25".
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