What is a search engine?
A search engine is a computer program that retrieves documents or files or data from a database or from a computer network (especially from the internet). The search results are usually presented in a list and are commonly called hits.
Mamma.com is called the mother of all search engines.Mamma.com is also a "smart" metasearch engine. Every time you type in a query at a metasearch engine, they search a series of other search and content sites at the same time, compile their results, and display them either by source or by integrating them in a uniform manner, eliminating duplicates, and resorting them according to relevance. It's like using multiple search engines, all at the same time. By using a metasearch engine, you get a snapshot of the top results from a variety of search engines (including a variety of types of search engines), providing you with a broad scope of information.
Google scholar provides a new method of locating potentially relevant articles on a given subject by identifying subsequent articles that cite a previously published article. Google scholar provides searching for educational literature, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. It’s a favorite search engine for all scholars.
There are a large variety of topics covered including teaching, learning, libraries, charter schools, special education, higher education, home schooling, and many more. Eric Digest is targeted specifically for teachers, administrators, policymakers, and other practitioners, but generally useful to the broad educational community. It is designed to provide an overview of information on a given topic, plus references to items providing more detailed information. The site link at the homepage of the website included Search for ERIC Digests, About, Libraries, Espanol, and Privacy Policy .
Yahoo is a search engine, subject directory, and web portal. We can search according to certain different categores like web, images, video, local, shopping, and etc. You can also access all the big Yahoo search options here, such as Yahoo Mail, Yahoo Music, Yahoo News, etc.
Below listed five criteria to show the similarities and difference between mamma.com, Google scholar, Eric digest and yahoo.com.
| Criteria / Search Engine | Mamma.com | Google scholar | Eric Digest | Yahoo.com |
| Category | Yes. We can search according to certain different categories like webs, jobs, videos, shop, travel, yellow pages, white pages. | No. | No. | Yes. We can search according to certain different categores like web, images, video, local, shopping, and etc. |
| Advanced Search | No. | Yes. | No. | Yes. |
| Preferences Available | No. | Yes. | No. | Yes. |
| Result Search (taking the example of “E-learning”) | 26 hits | 15,500 hits | 825hits | 221,000,000 hits |
| Related Researches/Search suggestion | Yes. The searh suggestions for “E-learning” are E-learning Definition, benefits of E-learning, navy knowledge online, who invented E-learning, history of E-learning, etc. | No. | No. | Yes. The searh suggestions for “E-learning” are Navy E-learning, E-learning utm, E-learning course and etc. |
| Information provided | All aspects | Academic | Academic | All aspects |
| Type of search engine | Metasearch engine | Regular and common search engine | Regular and common search engine | Regular and common search engine |
** Yahoo.com provided the choice of searching in the web all over the world or just searching the pages from Malaysia whereas Ericdigests.Org provided the choice of searching in the web or just ericdigests.org.
** Ericdigests.Org is powered by Google.
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