keyword: int

This keyword is used to declare a variable of type int, a signed 16-bit integer at a minimum, which can hold values between -32,768 and 32,767. On desktop computers, int is nearly always 32-bit, but the Arduino is actually using an 8-bit microprocessor, so the size is reduced to 16-bit to be faster. See Performance Considerations for things you should watch out for when writing software.

Usage:

int x = 5; // X is an integer value that contains 5.