What is the difference between Go's variadic functions and regular functions?

In Go, variadic functions are functions that can accept a varying number of arguments of the same type. They are defined by including an ellipsis (…) before the type name of the last parameter in the function signature. For example:

func sum(nums ...int) int {
    total := 0
    for _, num := range nums {
        total += num
    }
    return total
}

In the above example, **sum** is a variadic function that takes an arbitrary number of **int** arguments and returns their sum.

Regular functions, on the other hand, take a fixed number of arguments of specific types. For example:

func add(a, b int) int {
    return a + b
}

In the above example, **add** is a regular function that takes two **int** arguments and returns their sum.

The key difference between variadic functions and regular functions is that variadic functions can take an arbitrary number of arguments, while regular functions take a fixed number of arguments. This makes variadic functions more flexible and allows them to handle different numbers of arguments without having to define multiple functions with different numbers of parameters. However, using variadic functions can sometimes make it harder to reason about the code and can lead to more complex function signatures.