Cognitive Behavior Therapy (CBT) is a type of psychotherapy that focuses on modifying distorted thoughts and behaviors, based on the interconnectedness of thoughts, emotions, and actions. The therapy aims to identify and change negative cognitions, addressing issues such as depression, anxiety disorders, and PTSD through structured sessions lasting 12-25 weeks. While CBT can yield long-term results by teaching rational self-counseling skills, it may be less effective for clients lacking concentration or dealing with complex mental health needs.