Business Insider asked etiquette experts when it's appropriate to send a handwritten thank-you note. They said a note is essential after staying at someone's home or receiving a personalized gift.

One piece of career advice that's stood the test of time is to write a thank you note to anyone you interview with for a job. Doing so can help give you an edge to stand out from other applicants, ...

Hiring experts say getting notes from job interviewees can add depth to their evaluations, but not receiving them shouldn’t shut down an applicant’s chances. Sending a thank-you note after a job ...