Expand and collapse content.
Collapsible content is often found in tables. By expanding or collapsing an element the user has easy access to additional information without leaving the current view.

Using icons

An icon is often used on the button to expand or collapse an element. The icon should point in the direction of the action; it should not illustrate the current state. E.g. if you were to swap the icon with text it should say "Expand" when collapsed and "Collapse" when expanded.
The icon points in the wrong direction of what will happen.
The icon illustrates what will happen when clicking on it.
If a large number of lines are expandable, you can provide a button to expand/collapse all items at once.
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