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Originally, a web beacon was a small (usually pixel transparent) GIF or PNG image (or an image of the same color as the background) that was embedded in an HTML page, usually a page on the web or the content of an email.Modern web beacons also use the HTML IFRAME, style, script, input link, embed, object, and other tags to track usage.There is a work in progress to standardize an interface that web developers can use to asynchronously transfer small HTTP data from the User Agent to a web server that call it simply beacons (in the context of web development) which can be used to send data to a web server prior to the loading of the document without delaying the load and affecting the perception of page load performance for the next navigation.A web beacon is any of a number of techniques used to track who is reading a web page or email, when, and from which computer.They can also be used to see if an email was read or forwarded to someone else, or if a web page was copied to another website. Some emails and web pages are not wholly self-contained.They may refer to content on another server, rather than including the content directly.

Web bugs are typically used by third parties to monitor the activity of customers at a site.Web beacons are used by email marketers, spammers, and phishers to verify that email addresses are valid, that the content of emails has made it past the spam filters, and that the email is actually viewed by users.When the user reads the email, the email client requests the image, letting the sender know that the email address is valid and that the email was viewed.Images and other content do not have to be invisible: any element can be used for tracking.Typically advertisements, banners and buttons are fetched from their site, not from the main site.

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