CBT stands for cognitive behavior therapy. First let us look at what cognitive or cognition means. Cognition is a scientific term for the thought process, which would include judgment, knowledge, perceptions and memory.
So back to the original question, CBT is a talking therapy which focuses on your thought processes and behavior.
Unlike psychotherapy and other therapies, CBT is focused on the present and the future rather than the past.
CBT is a short therapy which can last weeks to several months. The length of the treatment will vary with each individual. The sessions are normally held on a weekly or fortnightly basis and from thirty minutes up to one hour.