As you listen to your guests sing to you on your birthday, you may see a long banner, or sign, hanging from the ceiling and announcing in sparkly letters, "Happy Birthday to You!"
The noun banner often refers to a long sign that is announcing or advertising something. A banner might declare "Congratulations!" "Free Hot Dogs Here!" or, at a protest, "We're Not Going to Take It Anymore!" Banners have also gone virtual; it's hard to avoid seeing at least one annoying advertising banner across the top of any highly-trafficked website. A banner can also be a flag, as in "The Star Spangled Banner," or a championship banner hanging in a school gym.