Refers to a professional who provides care for the elderly or disabled, typically in a nursing home or home-visit setting. The English gloss 'nurse' is misleading; a 介護士 is not a licensed medical nurse (看護師).
She works as a caregiver at a special nursing home for the elderly.
介護士の資格を取るために勉強中です。
I'm studying to get a caregiver certification.
She got a certification and became a care worker.
My older brother works as a care worker at a facility.
He attended a vocational school to get his care worker certification.