Years ago everyone had a button box. Buttons were saved for possible reuse, they were to good to throw away. When a item of clothing was worn out the buttons were cut off and saved in a button box, the clothing then used as a cleaning rag.
I have the button box that at one time belonged to my great uncle. It came with an assortment of buttons, some metal, some cloth, some plastic, some leather. We have added to it over the years, when the kids were young they loved to look through the "box".
Today people collect buttons, gathering them from antique shops, auctions, or garage sales. Others use buttons to make button art.
We keep our buttons for reuse, or just because they are too good to throw away.