This is the 420th most frequent Russian word.
промышленности
"Industry" or "industrial sector."
Here "промышленности" is used in the genitive singular form to specify the field or sector.
Россия активно развивает сферу промышленности.
Russia actively develops the field of industry.
Here "промышленности" is in plural form, denoting various industries.
В современном мире промышленности играют важную роль.
In the modern world, industries play an important role.
Here "промышленности" is in the prepositional singular form, indicating the area of focus.