There are many, some are 'problems' and some are 'techniques'.

Automatic Programming: The task of describing what a program should do and having the AI system 'write' the program.

Bayesian Networks: A technique of structuring and conferencing with probabilistic INFORMATION. (Part of the "machine learning" problem).

Constraint Satisfaction: solving NP-complete problems, using a variety of techniques.

Knowledge Engineering/Representation: turning what we know about PARTICULAR domain into a form in which a computer can understand it.

Machine Learning: Programs that learn from EXPERIENCE or data.

Natural Language Processing(NLP): Processing and (perhaps) understanding human ("natural") language. Also known as computational linguistics.

Neural Networks(NN): The study of programs that function in a manner similar to how animal brains do.

Planning: given a set of actions, a goal state, and a PRESENT state, decide which actions must be taken so that the present state is turned into the goal state

Robotics: The intersection of AI and robotics, this field tries to get (usually mobile) robots to ACT intelligently.

Speech Recognition: Conversion of speech into text.

There are many, some are 'problems' and some are 'techniques'.

Automatic Programming: The task of describing what a program should do and having the AI system 'write' the program.

Bayesian Networks: A technique of structuring and conferencing with probabilistic information. (Part of the "machine learning" problem).

Constraint Satisfaction: solving NP-complete problems, using a variety of techniques.

Knowledge Engineering/Representation: turning what we know about particular domain into a form in which a computer can understand it.

Machine Learning: Programs that learn from experience or data.

Natural Language Processing(NLP): Processing and (perhaps) understanding human ("natural") language. Also known as computational linguistics.

Neural Networks(NN): The study of programs that function in a manner similar to how animal brains do.

Planning: given a set of actions, a goal state, and a present state, decide which actions must be taken so that the present state is turned into the goal state

Robotics: The intersection of AI and robotics, this field tries to get (usually mobile) robots to act intelligently.

Speech Recognition: Conversion of speech into text.