What is fusion energy that billionaire Jeff Bezos invested millions of dollars in this technology?

Is this the answer to the world energy crisis that will surely take place?

What is fusion energy that billionaire Jeff Bezos invested millions of dollars in this technology?
Fusion energy is the energy produced in nuclear fusion.

Billionaire Jeff Bezos announced to invest a mountain of money in fusion technology . For a long time, people who dream of water can hold the power of a star, but many obstacles have made that dream of “endless energy” come true. The industry’s two biggest obstacles are:

So what is a fusion reactor? Please watch the following video, edited by the YouTube channel Kurzgesagt, to better understand the energy (?) future of humanity: