There may be a situation when the content of an element might be larger than the dimensions of the box itself. For example given width and height properties did not allow enough room to accommodate the content of the element.
CSS overflow property allowing you to specify whether to clip content, render scroll bars or display overflow content of a block-level element.
This property can take one of the following values: visible (default), hidden, scroll, and auto. CSS3 also defines the overflow-x and overflow-y properties which allow for independent control of the vertical and horizontal clipping.