A diagram of database tables, each table is a small box with a scroll bar, lines connect the boxes showing the connections.

From: https://www.google.com/search?q=database+tables&espv=2&biw=1436&bih=805&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjpl--i1pPMAhVCGD4KHVL0Dr0Q_AUIBigB#imgrc=ezrLzmsn6ZMzQM%3A