Base-64 is a method for encoding binary data into a text format using a set of 64 different characters. This encoding is commonly used to transmit data over media that are designed to deal with text, ensuring that the data remains intact without modification during transport. The characters used in Base-64 include uppercase and lowercase letters, digits, and two additional symbols, typically + and /. Base-64 is often utilized in various applications, such as email attachments and data URLs in web development. By converting binary data into a text representation, Base-64 allows for easier handling and storage of data in systems that primarily support text.