The great oracle Wiki says Familiarity bias is a “rule of thumb” that people like you and I use when forming a judgement, decisions or beliefs – Sounds all highbrow and impressive but leaves you scratching your head, wondering at the meaning, doesn’t it?
To make understanding easier, let’s begin with an example; You are working in a corporate office for years. You are stagnating in the job. You know that you can find a better job with your experience coupled with qualifications but you are accustomed to the people, the pace and the place, So you end up going day after day to the same old boring job.
Or
You are worried about your future. You expect you sunny days to be eclipsed by constant rainy