The expression "k + 1" represents a simple mathematical operation where a variable, denoted as k, is increased by one. This operation is fundamental in arithmetic and algebra, often used to describe sequences, functions, or to solve equations. For example, if k equals 3, then "k + 1" would equal 4. In programming and computer science, "k + 1" can be used in loops and algorithms to iterate through elements or to count occurrences. It helps in scenarios like indexing arrays or lists, where you may need to access the next element based on the current index k.