Indicates that something is small in size or limited in amount/degree. Placed before a noun to qualify it (e.g., a small town). Common in both speech and writing.
小さな町に住んでいるので、みんな顔見知りだ。
I live in a small town, so everyone knows each other.
小さな声でお願いしたが、聞こえなかったようだ。
I asked in a small voice, but it seems they couldn't hear me.
彼女は小さなことでも喜んでくれる人だ。
She is someone who is pleased even by small things.