Base64 literally means - the positioning system with base 64. Here 64 is the number of characters in the encoding alphabet from which the final alphanumeric text is based on the Latin alphabet. The number corresponds to the highest power of two (26), which can be represented using printed ASCII characters. This system is widely used in e-mail to represent binary files in the message text (transport coding). All the well-known variants known as Base64 use the symbols A-Z, a-z and 0-9, which is 62 characters; for the missing two characters, different symbols are used in different systems.