Which is the back button?
In all browsers, the shortcut key combination for the back button is Alt + Left arrow key. Also, the backspace key works in many browser to go back. If you want to return to the page you came back from you can use the forward button after using the back button.
How does a back button work?
A back button in the browser lets you back-up to the copies of pages you visited previously. The web browser's back and next buttons work well with web sites that provide information that changes infrequently, such as news and shopping web sites.