Today has been nicknamed Cyber Monday because it is usually the busiest online shopping day of the year.
Experts reckon £450 million will be spent on gifts in the next 24 hours - that's around £312,000 a minute!
It's predicted there will be 7.7 million online transactions; a 16% increase compared to this day last year.
Why is today the busiest?
Well, of course the main reason is because Christmas is getting nearer, and today is the first Monday of December, but experts say the media attention could add to sales too.
Shopping expert Bryan Roberts, said that the amount of "hype" around these promotional days mean they can become big, well-known events very quickly.
He says clever advertising helps to encourage shoppers to get online.