From the MDN docs:
bind()method creates a new function that, when called, has its
thiskeyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.
It works by “binding” the function to the context that you specify. Very often you use it to make sure that the surrounding this will be available to the function when it is called later.
This is a confusing subject, don’t be worried if complete understanding eludes you for now.
this before diving too deeply into
Once you have a basic grasp on
this, then it’s worthwhile to look at