What does hot zinc dipped mean?

While searching for the best anti-corrosive protection for steel people tend to hark back to the technique of hot-dip galvanizing.

Thereby pieces of metal (which should be in a final version) are put into a dip of hot, fluid zinc.

The coating which can be achieved by that covers all gaps and edges and thus can be seen as the highest possible protection from any weather. This procedure is complex and expensive.