science

Link exchange

Link exchange is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Link exchange rather than just read about it. In short: A link exchange is a confederation of websites that operates similarly to a web ring. Webmasters register their websites with a central organization, that runs the exchange, and in turn receive from the exchange HTML code which they insert into their web pages.

Key takeaways

Link exchange belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Link exchange to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Link exchange from memory before moving on to harder problems.

Reference excerpt

A link exchange is a confederation of websites that operates similarly to a web ring. Webmasters register their websites with a central organization, that runs the exchange, and in turn receive from the exchange HTML code which they insert into their web pages. In contrast to a web ring, where the HTML code simply comprises simple circular ring navigation hyperlinks, in a link exchange the HTML code causes the display of banner advertisements, for the sites of other members of the exchange, on the member web sites, and webmasters have to create such banner advertisements for their own web sites. The banners are downloaded from the exchange. A monitor on the exchange determines, from referral information supplied by web browsers, how many times a member website has displayed the banner advertisements of other members and credits that member with a number of displays of its banner on some other member's web site. Link exchanges usually operate on a 2:1 ratio, such that for every two times a member shows a second member's banner advertisement, that second member displays the first member's banner advertisement. This page impressions:credits ratio is the exchange rate. One of the earliest link exchanges was LinkExchange, a company that is now owned by Microsoft. Link exchanges have advantages and disadvantages from the point of view of those using the World Wide Web for marketing. On the one hand, they have the advantages of bringing in a highly targeted readership (for link exchanges where all members of the exchange have similar websites), of increasing the "link popularity" of a site with Web search engines, and of being relatively stable methods of hyperlinking. On the other hand, they have the disadvantages of potentially distracting visitors away to other sites before they have fully explored the site that the original link was on. Engaging in link exchanges or paid linking activity is highly discouraged by Google and not recommended for webmasters seeking an advantage in search engine rankings. Google considers excessive link exchanges and exchanging reciprocal links "Link Schemes" and can suppress the linked site in search engine results or block it altogether.

Worked examples

Example 1 — a first encounter with Link exchange

Start with the simplest possible case. Write down what Link exchange claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Link exchange before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Link exchange ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Link exchange

In research: Link exchange appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Link exchange in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Link exchange is common in secondary-school and first-year university syllabi. It links to neighbouring topics Internet terminology, Online advertising, Search engine optimization, so understanding it makes those chapters shorter.
In everyday life: Look for Link exchange outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Link exchange in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Link exchange means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Link exchange out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Link exchange in simple terms?

Why does Link exchange matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Link exchange?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Link exchange.