What Is Algorithm?
An algorithm is a set of simple rules that you follow, step by step, to solve a problem or do a job. Computers use algorithms all the time to make decisions.
Definition
An algorithm is a clear, ordered list of steps that always tells you what to do next. If you follow the steps correctly, you will get the same type of result every time.
Why Algorithm Matters
Algorithms are important because they help us:
- Make computers and phones do useful things
- Sort data, like putting numbers or names in order
- Search the web and choose which pages to show first
- Recommend videos, songs, or products you may like
- Save time by doing tasks faster and more accurately than humans
In search engines, algorithms decide which pages appear at the top of the results, so they are a big part of SEO.
How Algorithms Work
Most algorithms follow this simple pattern:
- Input Data goes in. For example your search words or a list of numbers.
- Steps The algorithm checks the data and follows its rules, one by one.
- Output A result comes out. For example sorted numbers or a list of search results.
If the steps are written well, the algorithm uses as few moves as possible, which makes it fast and efficient.
Algorithm vs Related Terms
- Algorithm vs Program An algorithm is the plan of steps. A program is that plan written in a computer language so a machine can run it.
- Algorithm vs Formula A formula is usually a math rule in symbols. An algorithm can be math, but can also be any step by step process, even in words.
- Algorithm vs Heuristic An algorithm aims to be exact every time. A heuristic is a quick rule of thumb that may not always give the best answer but is fast and simple.
Example of Algorithm
Here is a very simple algorithm to find the biggest number in a list:
- Take the first number and call it “current biggest”.
- Look at the next number in the list.
- If that number is bigger than “current biggest”, replace “current biggest” with this number.
- Repeat steps 2 and 3 until you reach the end of the list.
- When there are no more numbers, “current biggest” is the answer.
Search engines use much more complex algorithms, but the idea is similar. They follow many rules to decide which pages look most useful.
FAQs
Is an algorithm only for computers
No. A recipe, building instructions, or school math method can all be algorithms, because they are step by step rules.
Why do search engines use algorithms
They use algorithms to quickly scan billions of pages, judge quality and relevance, and show the best results for each search.
Are algorithms always correct
Algorithms do exactly what they are told. If the rules are wrong or unfair, the results will also be wrong or unfair.
Do I need to know math to understand algorithms
Basic algorithms can be understood with simple logic. Harder algorithms may use more math, but the main idea is still step by step problem solving.
What is a search algorithm
A search algorithm is a special kind of algorithm that looks through data, such as web pages, to find and rank the most helpful results for your query.
