A polite expression meaning to receive help or be indebted to someone; used to express gratitude or to indicate one will be / has been under someone's care or assistance.
来週から御社でお世話になります。どうぞよろしくお願いいたします。
I will be joining your company from next week. I look forward to working with you.
引っ越しのときは友人にお世話になった。
My friends helped me when I moved.
留学中は現地のホストファミリーに大変お世話になりました。
While studying abroad I was greatly taken care of by my host family.