So What's the Web 3.0?

To be honest, I was confused, I learned about Web 3.0 through some video bloggers, they explained in simple words what Web 3.0 is, they told me that Web 3.0 is something that would belong to you, just like those social accounts and game accounts that I signed up for, but I didn't own them, and if one day they disappeared I would be helpless. And Web 3.0 will let me always have them, is that right?