Characterization is a literary device that writers use to develop fictional characters in a story, that is to say, to reveal a character's physical appearance, personality, interests, or motifs. There are two types of characterization: direct and indirect.
When writers use direct characterization, they directly tell readers how the character is, in other words, they make direct statements about the character and do not leave anything open to interpretation. For example, direct statements that say how a character is, like "Liz is a young and spoiled girl," or "He was a tough and introvert guy, that's why he didn't talk much" are direct characterization.