What does as innocent as a lamb mean?

The phrase "as innocent as a lamb" refers to someone who is pure, naive, or harmless, evoking the image of a young lamb that is often associated with innocence and gentleness. It suggests a lack of malice or wrongdoing, highlighting the person's vulnerability and purity in character. This expression is often used to describe individuals who are perceived as trusting or unknowing of the darker aspects of life.