What are District Attorneys?

i know they are lawyer of the people but i need a more specific answer
prosecutors
When someone commits a crime and needs to be sued by the government as opposed to a private citizen bringing suit, the D.A. brings the suit. He or she is the prosecutor.

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Answers:
DA's only prosecute state law crimes in the district/town in which they serve.

Federal crimes are prosecuted by U.S. Attorneys.

If a city is being sued in civil court, it is usually not the DA who defends but the city/town attorney or the city's 'corporation counsel' or some office like that.