The term "Atoi" refers to a function commonly used in programming, particularly in languages like C and C++. It stands for "ASCII to integer" and is designed to convert a string of characters that represent a number into an actual integer value. For example, if you have the string "123", using the Atoi function will convert it to the integer 123, making it easier to perform mathematical operations. Using Atoi is straightforward, but developers must be cautious. If the string contains non-numeric characters, the function may return unexpected results or zero. Therefore, it's essential to ensure that the input is valid before using Atoi to avoid errors in your program.