When you delete a file on your Mac, it's moved to the Trash. And just like Recycle Bin on Windows PC needs to be emptied from time to time, so does the Trash.
On Mac, you can empty all of your Trash or just certain items from it. Plus, you can have the Trash emptied automatically, so you don’t have to worry about doing it yourself.
If you’re new to Mac, here is how to empty the Trash.