Comprehension involves fully understanding written text. It has several levels from lowest to highest:
1. Literal level involves understanding facts and details directly stated.
2. Interpretive level involves drawing inferences and understanding implied meanings.
3. Applied level involves extending ideas to new situations.
Factors like motivation, background knowledge or schema, and metacognition affect a reader's ability to comprehend. Readers must understand words, ideas, sequences, causes and effects, and think critically about texts.