Members of the population who select themselves. E.g., advertising your study on a notice board.
What is a strength of volunteer sampling?
Audiences can be reached through many forms of advertisement, e.g., online or in person. This is a strength as it often achieves a large sample size.
What is a weakness of volunteer sampling?
Volunteers may show similar characteristics as they selected themselves for the study. This is a weakness as it increases the chances of yielding an unrepresentative sample.