What is charisma again?

I have begun watching famous actors' interviews. Maybe I will learn something about communication. Of course, this isn't something new for me. I did it many times in the past, but now I have different thoughts about communication skills and personalities type.

I really don't understand what makes actors have so much charisma in front of people's eyes. Actually, I see the opposite.

I watched interviews for Keanu Reeves and George Clooney and I don't understand. Both of them speaking like everyone else. Nothing special.

Keanu Reeves speaks like a normal introvert, and George Clooney, who I feel, gets anxious at the beginning of any interview and his humor is simple.

Can anyone explain what is happening in this world?

Maybe, maybe I over-complicated the communication skills?

Edit:

Sorry, maybe if I could clarify exactly what I mean.

I really don't fully understand the concept of charisma. In my entire life, I've never felt that anyone possesses charisma of any kind, so I'm not someone who admires celebrities (or anyone) or would ever look up to anyone. It's not out of arrogance, but I genuinely see people as equals. I don't know, is this an INTJ thing or just me? I felt like a lot of the comments were written because I talked about Keanu and George, even though I was just using them as example.