What are passive voice and active voice? How do they use it?

The subject of active voice is people, and the subject of passive voice is things;

Passive voice is mainly composed of be plus past participle, indicating passive situation.

Example: this

teacher

be

Wanted.

This sentence is not what the teacher wants, but what the teacher wants, which means to recruit teachers.

Another example is

be

a

girl

call out

Mary

Only this girl's name is Mary, so she uses her nickname.

While others should be active.

take for example

boy

be

pluck

apple

Boys are active and apples are passive.

This is the active voice.