Bias is a tendency to favor or support one person, group, or point of view over another resulting in unfairness. It can occur when people rely too heavily on initial information, when media selectively reports information, or when people search for information confirming their existing beliefs. Prejudice refers to unfavorable opinions formed without knowledge or reason, and can influence how people interact, especially with those different from their own group. Common types of prejudice include racism, classism, ageism, and religious prejudice.