How to distinguish the use of Context.TODO from Context.Background in code, and in which cases are these functions used?

In Go, context.Background() and context.TODO() both return a context, but they are used in different situations:

• context.Background() is the base, empty context, typically used as the root context in main functions, tests, or during initialization. It indicates that the context is not canceled and contains no values.

• context.TODO() is used as a placeholder in parts of the code where the context is not yet defined or decided. It signals to developers that they need to revisit this part later to choose an appropriate context.

Example:

func main() {
    ctx := context.Background() // root context
    process(ctx)
}

func process(ctx context.Context) {
    // if we don't yet know which context to pass
    childCtx := context.TODO()
    doSomething(childCtx)
}

In summary:

• Use Background() as the root context.
• Use TODO() as a temporary placeholder when the context is not yet determined.