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Shortcuts: WP:0 WP:START Below are content navigation systems to help you browse the encyclopedia. They serve as an alternative to the search box, and are especially useful when you don't know exactly what you are looking for, or for when you want to see everything on a particular subject. Topic lists Presenting article links, list articles provide the function of tables of contents. Overviews Overview—main articles of various topics Outlines—subject summaries, as follows: Ease of discovery—outlines show which topics belong to a subject and why Subject structure—outlines show topic relationships (what belongs to what) List of academic disciplines and sub-disciplines—subjects studied in college or university Classification systems providing an outline or overview of knowledge: List of Dewey Decimal classes—top two levels of this library classification system, linked to Wikipedia articles Library of Congress Classification—LCC subjects linked to Wikipedia articles Outline of Roget's Thesaurus—articles organised into a system based on six classes, with thousands of branches, following Roget's system Item lists Lists—List of lists of related items (things) Two of the broadest item list collections are: Lists of countries and territories and many lists by country Lists of people including by nationality and by occupation Timelines Timelines—list articles chronologically. List of centuries List of decades List of historical anniversaries—e.g. events on January 1 of any year 2015—major events this year Portal:Current events—featured current events and related project activities Deaths in 2015—lists notable people who died this year Category:Graphical timelines—graphical timelines in the category and subcategories, arranged alphabetically Lists of articles by quality or popularity Featured content Featured content is the best Wikipedia has to offer, via vigorous peer review. Presented by type: Featured articles · Featured lists · Featured pictures · Featured portals · Featured sounds · Featured topics Most popular articles Wikipedia:Top 5000 pages (of the last week) Wikitop—Top 30 most popular articles by categories, with user comments on traffic jumps Vital articles Topics considered most essential, from 10 articles in Level 1 to approaching 10,000 in Level 4. Vital articles Level 1     Level 2     Level 3     Level 4 Articles are also categorized by importance in their field(s) Alternate formats Portals A portal introduces the reader to a subject by presenting images, categories and excerpts of key articles. Portals also guide editing by providing to-do lists. Portals · Category:Portals Wikipedia books Wikipedia books are collections of Wikipedia articles that can be viewed, downloaded, or printed into a book. They provide a roadmap for a course of study in a particular subject. Category:Wikipedia books (community books)—an alphabetical list of the books Category:Wikipedia books—a list of the books, categorized by topic Spoken articles Growing collections of Wikipedia articles are starting to become available as spoken word recordings as well. Category:Spoken articles—an organized list of all spoken articles Wikipedia:Spoken articles—some general information about the spoken article technology Glossaries Glossaries are lists of terms with definitions. Wikipedia includes hundreds of alphabetical glossaries. Glossaries · Category:Glossaries Wikipedia's index systems Category system Wikipedia's collection of category pages is a classified index system. It is automatically generated from category tags at the bottoms of articles and most other pages. Nearly all of the articles available so far on the website can be found through these subject indexes. If you are simply looking to browse articles by topic, there are three top-level pages to choose from: Category:Main topic classifications—probably what you are looking for: Arts, History, Technology, etc. Category:Fundamental categories—organizes articles into 'abstract' ontological categories in a way that every article can reasonably be expected to be classified within it; and Portal:Contents/Categories—a hand-crafted list of first- and second-level topic categories. For biographies, see Category:People categories by parameter. Category:Contents is technically at the top of the category hierarchy, but contains many categories useful to editors but not readers. Special:Categories lists every category alphabetically. Alphabetical lists of articles Wikipedia's alphabetical article indexes Special:Allpages lists all of the current pages in Wikipedia. Portal:Contents/A–Z index provides an easy way to skip to a particular part of the alphabet in the list of all articles. Lists of alphabetical indexes Category:Indexes of topics—alphabetical list of topic indexes Portal:Contents/Indexes—indexes sorted by topic area Engineering is the application of mathematics, empirical evidence and scientific, economic, social, and practicalknowledge in order to invent, design, build, maintain, research, and improve, structures, machines, tools, systems,components, materials, and processes. The discipline of engineering is extremely broad, and encompasses a range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied science, technology and types of application. The term Engineering is derived from the Latin ingenium, meaning "cleverness" and ingeniare, meaning "to contrive, devise".