In Haskell, there are various types of monads that can be used to structure computations and manage side effects. Here are some commonly used monads in Haskell:

1. Maybe Monad : The Maybe monad is used for computations that may or may not produce a result. It allows for safe handling of optional values by encapsulating the possibility of failure or absence of a value.

2. List Monad : The List monad represents non-deterministic computations or computations that can produce multiple results. It allows for working with lists of values and enables operations like filtering, mapping, and combining.

3. IO Monad : The IO monad is used for performing input/output operations in Haskell. It encapsulates actions that interact with the external world, such as reading from or writing to files, network communication, or user input/output.

4. State Monad : The State monad is used to manage stateful computations. It provides a way to thread state through a series of computations while abstracting away the details of state management. The State monad allows for creating pure functions that simulate mutable state. 5. Reader Monad : The Reader monad is used for computations that depend on a shared environment or configuration. It provides a way to pass immutable, read-only values to multiple functions without explicitly passing them as arguments.

6. Either Monad : The Either monad is used for computations that can result in either a successful value or an error. It allows for handling and propagating errors in a controlled manner.

7. Writer Monad : The Writer monad is used for computations that produce a result along with some additional output or log. It allows for accumulating values or logs while performing computations and extracting the final result.

8. Continuation Monad : The Continuation monad, also known as the Cont monad, is used for managing continuations or control flow in a program. It allows for representing computations as functions that take a continuation, enabling complex control flow operations.