Listening is the most important communication skill that we learn first in life. There are different types of listening including discriminating, comprehension, critical, biased, evaluative, and sympathetic listening. Critical listening involves careful and systematic thinking to evaluate whether a message makes sense based on facts or is biased. It has two parts - reflecting, which is restating what the speaker said, and probing, which asks for additional information. Developing critical listening skills can be improved by practicing recognizing facts versus opinions, uncovering assumptions, being open-minded, relying on reason, relating new ideas to older ones, and listening ethically.