If something is attractive, it is pleasing to look at or interesting. Also, if a person is attractive, they are good-looking and people like to look at them.
Being attractive is usually a very good thing. People like to be around attractive things and people.
Examples:
The flowers are very attractive.
She is an attractive person.
The attractive house is big and has a garden.
The cat thinks the fish is attractive.
The attractive rainbow filled the whole sky.
The attractive girl smiled and everyone looked at her.