With an object typically that object has some data that is specific to the object. For example the URL object I mentioned earlier has a web page address that is specific to that object. I could have other URL objects that would have different addresses associated with them.
And in many cases the object methods won't work without having that data stored in the object.
But there might be some methods associated with a class that don't rely on having an object with some data in it. In that case there's no need to create an object to use that method because you don't need the info an object stores.
So you could make that sort of method static. Then you don't need to create an object to use it.
