Personality is the particular combination of emotional, attitudinal, and behavioral response patterns of an individual.
Personality is the unique way an individual has learned to deal with the challenges of life and work. It is the general trend of how a person thinks and behaves.
It's based on a few inherited traits, but mostly it's how a person builds on that, making decisions in life to learn a certain way, interact a certain way, solve problems a certain way, etc.
Every personality is unique. There are no two exactly identical personalities. This is because no two people are alike and no two people grow up under the same conditions with the same experiences and decisions. Patterns of thought and action are ingrained, and the sum total is an individual's personality.
Personality is only one of the ways a person is unique. Separate from personality are knowledge, skills, values, motivations, memories, resources, and strengths of character.