What is social desirability bias?
This bias refers to our tendency to respond in ways that we feel are more appropriate or socially acceptable to others, even if the responses are therefore untruthful.
Example of social desirability bias in the hiring process.
It happens when candidates are put in a situation in which they are asked to evaluate themselves, which is the case in job interviews and personality questionnaires. Research has shown that it is very easy to manipulate a Big Five personality test, for example.
Personality questionnaires are also extremely prone to self-report bias (and therefore prone to intentional faking or unintentional self-presentation).