「素敵」は、人や物がとても美しかったり、いいなと思ったりした時に使う言葉です。

"素敵" is a word used when people or things are very beautiful or you think they are nice.

女性がよく使いますが、だれでも使えて、ほめる時にとても便利です。

Women often use "素敵", but anyone can use it, and it's very useful for giving compliments.