Answer:

Types of Search Engines

1. Crawlers
2. Directories
3. Hybrids
4. Meta

Explanation:

Descriptions

1. Crawler search engines, from the term itself uses a "crawler" to locate information on the internet.  The crawler searches through every single web pages, pulls out information via keyword/s, and adds them to the engine's database (the long lists of websites we see when we key in words on a search engine).
2. Directories are search engines powered by humans. A website needs to submitted and approved before it is included in the database.
3. Hybrids are combination of crawlers and hybrids which gives searchers a choice whether to look up the web or a directory and may give results that are either human powered or crawler obtained.  In such cases, the ones given by humans comes first on the list.
4. Meta search engines are those that serve to retrieve data from a web search engine to produce results. Also known as the aggregator, it sends queries to several search engines, this works by either combining results into a list, or categorizes them based on the source engine.

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