Search Engine: What You Need to Know

Search engines are powerful tools that help us find information on the internet. They allow us to enter keywords or phrases and get a list of relevant web pages that contain or relate to them. But how do search engines work and what are some of the challenges they face?

How Search Engines Work

Search engines consist of three main components: a crawler, an index, and a ranking algorithm.

• A crawler, also known as a bot or a spider, is a program that visits web pages and follows links to discover new content. It collects and stores data from each page, such as the title, the text, the images, the videos, and the metadata.

• An index is a database that stores and organizes the data collected by the crawler. It allows the search engine to quickly retrieve the relevant pages for a given query.

• A ranking algorithm is a set of rules that determines the order of the pages in the index based on their relevance and quality for a given query. It considers various factors, such as the keywords, the links, the authority, the popularity, and the freshness of the pages.

Challenges for Search Engines

Search engines face many challenges in providing accurate and useful results for users. Some of these challenges are:

• The size and diversity of the web. The web is constantly growing and changing, with billions of pages covering various topics and languages. It is impossible for any search engine to index all of them or to keep up with all the updates.

• The quality and reliability of the web. The web is largely unorganized and unregulated, with varying levels of quality and credibility among its pages. Some pages may contain inaccurate, outdated, biased, or misleading information. Some pages may also try to manipulate the ranking algorithm by using techniques such as keyword stuffing, link spamming, or cloaking.

• The complexity and ambiguity of queries. Users may have different intentions and expectations when they enter a query in a search engine. They may use different words or spellings to express the same idea. They may also use vague or general terms that can have multiple meanings or interpretations.

• The personalization and localization of results. Users may want different results depending on their location, preferences, interests, or history. Search engines may use various signals, such as the user's IP address, browser settings, cookies, or previous searches, to tailor the results to each user.


Search engines are amazing tools that help us access a vast amount of information on the internet. However, they are not perfect and they have limitations and challenges that affect their performance and accuracy. As users, we should be aware of how search engines work and what factors influence their results. We should also be critical and cautious when evaluating the information we find online.

Sheikh Md. Mahtabur Rahman

CEO / Founder

Sheikh Md. Mahtabur Rahman was born in Rangpur, Bangladesh in 1994 and completed his MBBS from the University of Rajshahi. He then pursued online courses in Digital Marketing, Web Design & Development & Video Production. He is currently a doctor, article writer and YouTuber. He has been fascinated by genetics since he was young and has been studying many different aspects of human biology including cancer, diabetes, immunology, hypertension, ageing and Alzheimer's disease.