In digital marketing, ToFu means “Top of Funnel” and refers to the first real contact someone makes with a website.
The funnel in question is the marketing funnel and is the journey people take from entering a website to undertaking an action (such as making a purchase).
ToFu, or Top of Funnel in this sense refers to things like a blog – anything that is interesting to a very broad group of people. The idea is to draw as many people as possible into being interested in your site.