A/B testing means showing two versions of a page to real visitors at the same time and letting the results pick the winner. Half see version A, half see version B, and the traffic decides, not opinion.
In plain English
It is the same idea as a taste test. You do not ask people which recipe they think is better; you serve both and count which plate comes back empty more often.
What to test first
Your headline
It is the biggest lever on the page, because it is the first thing anyone reads.
Your call to action
The words on the button change how safe it feels to click.
Your layout
Reordering or trimming a page can cut the friction between arriving and acting.
Worth remembering
Bing once tested a single headline change and revenue jumped 12%, worth over 100 million dollars a year.
One line of text. No redesign, no new features, just a different headline tested against the old one, and the difference was worth nine figures a year.
What to do about it
You do not need Bing-sized traffic to benefit from testing your headline and calls to action. Get a free website audit and I will show you the first thing worth testing on your site.
