Alternatively referred to as Control+B and C-b, Ctrl+B is a keyboard shortcut most often used to toggle bold text on and off.
How to use the Ctrl+B keyboard shortcut
In many programs, this keyboard shortcut has two purposes: to change highlighted text to bold or unbold (depending on its current state), or start typing bold text at the cursor's location.
Ctrl+B in an Internet browser
The Ctrl+B keyboard shortcut can serve different purposes depending on the Internet browser. In Firefox and Netscape, Ctrl+B displays the bookmarks. In Internet Explorer, Ctrl+B displays the favorites folder.
Ctrl+B in Excel and other spreadsheet programs
In Microsoft Excel and all other spreadsheet programs, pressing Ctrl+B when a cell(s) is selected will bold or unbold it. If you're editing the contents of a cell with no selected text, Ctrl+B toggles bold on and off.
Ctrl+B in Microsoft PowerPoint
Pressing Ctrl+B in Microsoft PowerPoint bolds the highlighted text.
Ctrl+B in Word and other word processors
In Microsoft Word and other word processors, highlighting text and pressing Ctrl+B makes the text bold. If the text is already bold, pressing Ctrl+B unbolds the text. Pressing Ctrl+B without anything highlighted starts typing bold text at the cursor's location.
Related keyboard shortcuts and keys
Below are links to related keyboard shortcuts and individual key pages.