Search engines rank web pages depending on their relevance to a user's query.

In finance, rate of return (ROR) or return on investment (ROI), or sometimes just return, is the ratio of money gained or lost on an investment relative to the amount of money invested. The amount of money gained or lost may be referred to as interest, profit/loss, gain/loss, or net income/loss. The money invested may be referred to as the asset, capital, principal, or the cost basis of the investment.

ROI is also known as rate of profit, rate of return or return. Return can also refer to the monetary amount of gain or loss. ROI is the return on a past or current investment, or the estimated return on a future investment. ROI is usually given as a percent rather than decimal value.

Source: wikipedia.org

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RSS is a family of web feed formats used to publish frequently updated digital content, such as blogs, news feeds or podcasts. Users of RSS content use programs called feed "readers" or "aggregators": the user "subscribes" to a feed by supplying to their reader a link to the feed; the reader can then check the user's subscribed feeds to see if any of those feeds have new content since the last time it checked, and if so, retrieve that content and present it to the user.

Source: webopedia.com

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