- An algorithm is a sequence or set of instructions for solving a problem.

- Set of rules to be followed in solving a problem.

- An algorithm is a step-by-step procedure which defines a set of instruction to be executed in a certain order to get the desired output.

- An algorithm can perform calculation, data processing, and automated reasoning task

- An algorithm can be implemented in more than on language.

**Important
Categories of Algorithm**

**Search:**Algorithm to search an item.

**Sort:**Algorithm to search item in a certain order.

**Insert**: Algorithm to insert an item in a data structure.**Update:**Algorithm to update an existing item.

**Delete:**Algorithm to delete an existing item.

**Characteristics
of an Algorithm**

**INPUT:** An algorithm should have zero or better define
the number of inputs.

**FEASIBILITY:** Algorithm should be
feasible with the available resources.

**INDEPENDENT:** An algorithm should have step-by-step
directions which should be independent of any programming codes.

**UNAMBIGUOUS:** Algorithm should be clear and unambiguous i.e
for each step and their input/output should be clear and must lead to only one
meaning.

**FINITENESS:** Algorithm must be terminated after a finite
number of steps.

**Important
Problem Types**

**Sorting****Searching****String Processing****Graph Problems****Geometric Problems****Numerical Problems**

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