A banner ad is a large advertisement on a website that stretches across the top or down the side of the window. It usually contains a link to the advertiser's website.
[computing]
banner ad in British English
noun
1.
a banner advertising a product
2.
an advert along the top of a page of a website
Examples of 'banner ad' in a sentence
banner ad
And they were happy to click on banner ads to see what the buzz was all about.
Al Ries and Laura Ries THE 22 IMMUTABLE LAWS OF BRANDING (2002)
In other languages
banner ad
British English: banner ad NOUN
A banner ad is a rectangular advertisement on a web page that contains a link to the advertiser's website.