dance
The French word for dance is 'danse'. It is used in the same way as in English, to describe the act of moving one's body rhythmically, usually to music. For example, one might say 'Je veux danser' which means 'I want to dance'.
I like classical dance.
This sentence is a simple expression of personal preference. 'J'aime' means 'I like', 'la danse' is 'the dance', and 'classique' is 'classical'.
She practices contemporary dance.
This sentence is used to describe someone's activity or habit. 'Elle pratique' means 'She practices', 'la danse' is 'the dance', and 'contemporaine' is 'contemporary'.
Dance is a form of art.
This sentence is expressing an opinion or fact. 'La danse' is 'The dance', 'est une forme' is 'is a form', and 'd'art' means 'of art'.