The expression "i=8" indicates that the variable i is assigned the value of 8. In programming and mathematics, this is a common way to define or update a variable. The letter i is often used as a placeholder for integers, especially in loops or sequences. In this context, the value 8 can represent various things, such as an index in an array or a count in a loop. Understanding variable assignment is fundamental in fields like computer science and mathematics, as it allows for dynamic manipulation of data and calculations.