います
there is, have (people and animals)
Place に + person/animal が + います
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います is the "there is" for living things that move by themselves: people and animals. 公園に犬がいます, "there's a dog in the park". Things use あります.
Like あります, it also means "have", for people: 兄が二人います, "I have two older brothers"; 彼女がいません, "I don't have a girlfriend".
The line is about being alive and moving on your own, not about size or importance. A fish in a tank is います; a tree is あります. A taxi waiting outside is often いる too, since there's a driver in it.
Plain form: いる. Negative: いない.
Register: Polite. Plain: いる, negative いない.
Examples
公園に犬がいます。
There's a dog in the park.
教室に先生がいません。
The teacher isn't in the classroom.
私は兄が二人います。
I have two older brothers.
田中さんは今、二階にいます。
Mr Tanaka is upstairs right now.
家に猫がいるよ。
We've got a cat at home.
池に魚がいます。
There are fish in the pond.