Term for 'key change' when going for the chorus

Modulation (the act or process of changing from one key to another) in music is always a pleasant surprise to listeners as well as an excellent tool for songwriters and musicians.

1. What is it called when the key changes in a song?
2. How do you change the chorus key?

What is it called when the key changes in a song?

In music, modulation is the change from one tonality (tonic, or tonal center) to another. This may or may not be accompanied by a change in key signature. Modulations articulate or create the structure or form of many pieces, as well as add interest. ... Modulation is the essential part of the art.

How do you change the chorus key?

It's not so hard to have, say, a verse in a minor key and a chorus in the relative major - like, E minor and G major. But - say - a verse in C major and a chorus in D major? Not easy.
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The music.