Mamma.com is a site owned and operated by Copernic Inc. (formerly known as Mamma.com Inc.). Mamma.com is a "smart" metasearch engine where when every time you type in a query Mamma simultaneously searches a variety of engines, directories, and deep content sites, properly formats the words and syntax for each, compiles their results in a virtual database, eliminates duplicates, and displays them in a uniform manner according to relevance. It's like using multiple search engines, all at the same time. Mamma also allows users to use advanced operators and is capable of turning our search partners on or off, depending on whether or not they support the operator in use. This is why we call it a smart metasearch tool.
Google does not only for website article, web search but it also allows users to search the Web for images (Google Image search engine), helping users find pictures, photos, help users find news, products, and other content like language tools, maps, video, have calculators and many more. If we want to find definition we don’t have to go to merriam webster dictionary we can just get it straight away on google.
Yahoo! Search helps users find information, news, images, products, local services, and answers from around the Web. Just like google yahoo also help users find products, and other content like maps,video, have calculators and many more.
This site provides one way to access the ERIC Digests (education articles) produced by the former ERIC Clearinghouse system. This web:-
-Provides short reports (1,000 - 1,500 words) on topics of prime current interest in education. There are a large variety of topics covered including teaching, learning, libraries, charter schools, special education, higher education, home schooling, and many more.
-Targeted specifically for teachers, administrators, policymakers, and other practitioners, but generally useful to the broad educational community.
-Designed to provide an overview of information on a given topic, plus references to items providing more detailed information.
-Produced by the former 16 subject-specialized ERIC Clearinghouses, and reviewed by experts and content specialists in the field.
-Funded by the Office of Educational Research and Improvement (OERI), of the U.S. Department of Education (ED).
-The full-text ERIC Digest database contains over 3000 Digests with the latest updates being added to this site in July 2005
From what I can see is that yahoo and google are almost the same pertaining their content and so on. There are so many similarities between these two. For example both webs provide email account for the users. Users can exchange data and of course email and many more. There is also what we call a “chat room” for users to straight away chat with others, for yahoo we call it yahoo messenger. Besides that, mamma, yahoo and google are similar because these three web are search engine web. And these four web are similar in terms of educational information. For example, all of these four web we can search for article pertaining education.
There are of course differences in these four webs. Mamma.com is a metasearch engine which ables to gather the best search results available from top search sources and to provide useful tools to its users and has resulted in its receiving multiple Honourable Mentions in the Best Metasearch category in the annual SearchEngine Watch Awards. Besides that, mamma (metasearch) results are more comprehensive compare to "regular" search engines (yahoo and google); catalogue anywhere from 0.5% to 30% of Web pages available online; by combining results from multiple sources the pool of web pages is greatly increased. In addition, metasearch engines are less prone to spammy results, since most spammers target one particular search site only, in their aim to achieve top ranking on it. They can't, however, target all search engines, and so spam tends to get pushed down in the results of a metasearch engine. Another difference between these four web is that mamma, yahoo and google are search engine web whereas ericdigest is not a search engine web.
All in all, all of these webs are actually very useful and we can easily comprise the information.