ELI5: Explain Like I'm 5

Null character

A null character, also known as a null terminator or simply a null, is a special character that has the value of zero. It is used in computer programming to mark the end of a string or array of characters.

Imagine that you have a long chain made out of colorful beads representing each letter of a word. At the end of the last letter, you add a special clear bead to show that it is the end of the chain. This clear bead is like a null character in programming.

When a program reads through an array of characters or a string, it keeps looking for the next character until it reaches the null character, which signals the end of the data. Without the null character, the program would not know when to stop reading and could potentially run into problems or errors.

In simpler terms, the null character is like a stop sign for programs, telling them when to stop reading a string or array of characters.