What is it called in a movie when the camera is focused just on one person, to make it look dramatic and emotional?

zooming in -- ??

focusing on -- ??
"one shot -- ??

I'm not sure.

close-up?

In filmmaking, the technique of focusing the camera on one person to create a dramatic or emotional effect is called a "Close-up shot." A close-up shot typically frames the subject's face, highlighting their expressions and emotions. To achieve this shot, the camera is brought closer to the subject, emphasizing their features and intensifying the overall impact on the viewers.

To recognize a close-up shot in a movie, look for the camera's proximity to the subject, usually capturing their face from the shoulders or chest up. Pay attention to the details and emotions conveyed through the actor's facial expressions, as close-ups can often emphasize their performance and draw the audience into the character's inner world.