A variant type in computer language is like a toy box that can hold different kinds of toys. Just like how a toy box can hold a car, a doll or a ball, a variant can hold different types of data, such as numbers, text or dates.
But just like how a toy box needs to be able to tell you which toy is inside, a variant type needs to be able to tell you what kind of data it's holding. Imagine each toy in the toy box having a different color tag on it to help you identify it. Similarly, a variant type has a special marker that tells you what data type it's holding at any time.
This can be very useful in programming because it allows you to work with different types of data without having to create separate variables for each type. Basically, it's like having a toy box that can hold all your toys, but you only need to take out the ones you want to play with at that time.