This is the 44th most frequent Russian word.
человек
"Человек" means "person" or "human" in English.
The word 'человек' here refers to humanity or an individual as a representative of humankind.
Человек всегда стремится узнать что-то новое.
A human always strives to learn something new.
Here, 'человек' refers to any human being as a person.
Этот человек добрый и всегда готов помочь.
This person is kind and always ready to help.
In this context, 'человек' is used as the measure word for counting people.