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A static local variable is a local variable that retains its value between function calls. When we declare a local variable with the 'static' keyword, it is only initialized once, and its value is preserved across multiple calls of the function that contains it.

The following characteristics of static local variables are important to note: a. They are declared and initialized only once throughout the program's execution. b. Their values are retained between function calls. c. They have a slightly longer lifetime compared to regular local variables, as they are only destroyed when the program terminates. d. They are useful when a function requires a value that persists from one call to another. The primary purpose of using static local variables is to maintain and control data across multiple function calls, without exposing the internal state of the function to the global scope or requiring a global variable.

Consider using a static local variable in the following scenarios: 1. When a function needs to maintain a state or value from one call to another, without exposing this information to the global scope. 2. When you want to limit the scope of a variable that needs to retain its value between function calls, to minimize the risk of side effects or unintentional modifications. 3. When you want to implement a counter or accumulator within a function, without relying on global variables. 4. When creating a function that has to generate unique identifiers or values with each call, such as a random number generator. In summary, a static local variable should be used when a function requires a variable to maintain its value between calls while keeping the variable's scope within the function, preventing unintended side effects and ensuring better program modularity.