What is affinity/similarity bias?
Also called in-group bias, it is the tendency favour one candidate over another candidate because you share a characteristic trait or past experience with this candidate. The more similarities you share, the more you will gravitate toward this candidate. This could be the same cultural background, interests, or even the same high school.
When trapping into this bias, Confirmation Bias will happen next during the job interviews.
Example of affinity/similarity bias in the hiring process.
When screening or interviewing a candidate, you will unconsciously be focused on assessing the similarities (or lack of similarities) you share with the candidate. The more similarities you share, the more likely it will be that you have a positive view of this candidate, regardless of their suitability for the specific role.