noun
Common loanword used in contexts like secret information, secret items, or secret events. Often appears in compound nouns.
これは会社のシークレット情報です。
This is the company's secret information.
彼女はシークレットシューズを履いている。
She is wearing secret shoes (height-increasing insoles).
秘密 is the native Japanese word for 'secret' and is more common in everyday speech. シークレット is a loanword often used in compound nouns or to give a modern, stylish nuance.
Borrowed from English 'secret'.