The expression "i=10" indicates that the variable i is assigned the value of 10. In programming and mathematics, this is a common way to define or initialize a variable, allowing it to be used in calculations or operations later in the code or equation. In this context, i can represent any integer value, and setting it to 10 means that whenever i is referenced, it will hold the value of 10. This is useful for loops, conditions, and functions where the value of i may change or be used multiple times.