There are several key features that are typically present in an algorithm:

1. Input: An algorithm takes one or more input values, which are used to perform a specific task.
2. Output: An algorithm produces one or more output values, which are the result of the task it performs.
3. Definiteness: An algorithm must be defined in a clear and precise way, with no ambiguity or uncertainty.
4. Finiteness: An algorithm must have a finite number of steps, and must terminate after a certain number of steps have been completed.
5. Effectiveness: An algorithm must be able to be implemented in a way that allows it to be carried out in a reasonable amount of time.
6. Generality: An algorithm must be able to be applied to a wide range of inputs and problems, rather than being specific to a particular set of inputs or problems.