a key driver — main factor (figurative, abstract)
an important factor or main reason that strongly influences a situation, change, or result, especially in discussions about trends, progress, or causes.
Say it like a native
Textbook Low interest rates were one of the most important reasons behind the growth.
Native Low interest rates were a key driver of the growth.
'A key driver of' is standard analytical phrasing; the paraphrase is bulky.
Pattern: a key driver of [noun/gerund]; [noun/gerund] is a key driver of [noun/phenomenon]
In use
- Rising energy costs have become a key driver of inflation in many countries.work
- In my opinion, urbanisation is a key driver of environmental problems, as it leads to increased pollution and greater demand for resources.IELTS speaking
Common mistake
✗ Tourism is a key driver for the economy.
✓ Tourism is a key driver of the economy.
'A key driver OF' something, not 'for'.
Common collocations
a key driver of— of growth, of change, of demand, behind
Don't confuse it
Unlike the literal meaning of 'driver' (a person who drives a vehicle), this sense is figurative and refers to something that causes or powers change or progress. It is more precise than simply saying 'reason' or 'cause', as it emphasizes influence and momentum.