In America, what's the difference between a Sheriff and a police?

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A Sheriff is an elected position that runs a police department called the Sheriff's office. Police who work at the Sheriff's office are called sheriff's deputies.

The Sheriff's department usually patrols a county, which covers multiple cities, and usually smaller towns that have no police.

Regular police department's usually patrol their city only.

We also have highway patrol, who patrol all the highways. Each state has their own.

There are also some states that have a state police, who patrol the whole state.

Also, the Sheriff's department usually run the county jails, and look for people wanted by the police.

Usually each county has a main jail. Anyone arrested in the county is taken there, even if another police department arrests someone in a major city, they are taken to the county jail.