Example:

Many old white people have prejudice against black people because of the deeply ingrained history between the two races. This can be visible, where people show it through actions or not visible, in which people have preconceived thoughts due to influence of outside factors.

the belief that different races possess distinct characteristics, abilities, or qualities, especially so as to distinguish them as inferior or superior to one another.

Example:

In a small isolated town the population is mostly light skinned. One day a black family buys a house in this town and moves in the very next day. On the first day of school the dark skinned boy enters the classroom only to find that nobody wants to sit with him causing himself to feel isolated and alone. Although at first didn't understand the reason, while he was going to get lunch he overheard multiple people talking about his skin color and how different he looked. Suddenly he understood and ran out of the school never to be back in this town again.

difference in size, degree, circumstances, etc.; lack of equality.

Example:

Across the world people experience pay gaps due to their gender. This is called the gender pay gap and it happens due to the preconceived notion that women are less useful.

strong affection for another arising out of kinship or personal ties

Example:

In life when somebody loves another person so much that they want to spend their whole lives together they get married to show their equal love and affection for each other.