As a noun:
* The impact of the car crash was devastating.
* The new policy had a significant impact on the company's profits.
* The artist's work had a profound impact on the art world.
As a verb:
* The meteor impacted the Earth millions of years ago.
* The new technology will impact the way we live and work.
* The decision to raise taxes will impact everyone in the country.
In a figurative sense:
* His words impacted me deeply.
* The music impacted my mood.
* The experience had a lasting impact on my life.
The specific use of "impact" will depend on the context of your sentence and the meaning you want to convey.