Research any topic before you write.
Find related topics. | Discover entities. | See connections. | Build a topical map.
A web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering).
History & Applications
Explore the main themes, entities and connections around Web crawler. Start with the topic map, then use the sections below for research and deeper semantic analysis.
Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Browse the full topic structure. Each item opens a new analysis centered on that subject.
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
See the strongest relationship patterns around the current topic before diving into the raw triples.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
web crawler pages crawlers crawling search url crawl also page engines urls may use server given engine resources used policy
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Web crawler | is a | outcome of a combination of policies | 0.90 | text |
| Web crawler | is a | server and the Web sites are the queues | 0.90 | text |
| Web crawler | is a | highly extensible Web Crawler written in Java and released under an Apache License | 0.90 | text |
| .html | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| .htm | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| .asp | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| .aspx | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| .php | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| .jsp | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| .jspx or a slash | instance of | a crawler may examine the URL and only request a resource if the URL ends with certain characters | 0.80 | text |
| Apache Solr | instance of | It can be used with many repositories | 0.80 | text |
| Elasticsearch | instance of | It can be used with many repositories | 0.80 | text |
These clusters group vocabulary that occurs around closely connected concepts in the source material.
Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.