We're all biased in one way or another - every single one of us, and that's a good thing. Others challenge our biases, and we challenge theirs. That's a good thing. It expands our understanding of how the world works.

Systemic bias on the other hand, is engineered to force a particular understanding, and that's obviously a bad thing. Systemic bias is engineered by a system such as a corporate or political entity. Curated Twitter or Farcebook feeds are examples of engineered bias.