The modifier key on the keyboard allows you to perform special functions.

Visual kei is a popular music genre in Japan.

Key Stage is an important phase in a student's education.

The Key Stages of education in the UK are Key Stage 1, Key Stage 2, Key Stage 3, and Key Stage 4.

I used a wine key to open the bottle of wine.

Key signatures are important in music theory.

I have a key bit in my pocket.

I found the key to the midway in the old treasure chest.

I forgot my key card at home.

I forgot my key cards at home.