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org /pub /png (home site) Portable Network Graphics ( PNG , officially pronounced / p ɪ ŋ / PING , [ 3 ] [ 4 ] colloquially pronounced / ˌ p iː ɛ n ˈ dʒ iː / PEE -en- JEE [ 5 ] ) is a raster-graphics file format that supports lossless data compression

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If this file does not exist, web robots assume that the website owner does not wish to place any limitations on crawling the entire site

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The same is true if the same file, even with the same name, is stored in more than one location in the directory hierarchy

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1 200 OK Date: Thu, 02 Jul 2026 17:06:44 GMT Content-Type: text/html; charset=utf-8 Vary: X-PJAX, X-PJAX-Container, Turbo-Visit, Turbo-Frame, X-Requested-With, Sec-Fetch-Site,Accept-Encoding, Accept, X-Requested-With ETag: W/"47aa9c1d17c88f3a190a8326a978c3c3" Cache-Control: max-age=0, private, must-revalidate Strict

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com , with the goal of convincing the recipient to accept and to read the email—and it is difficult for recipients to establish whether to trust this message

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NET Framework 5 Alternatives 6 See also 7 Notes 8 References 9 External links Toggle the table of contents DirectX 49 languages العربية Azərbaycanca Беларуская বাংলা Bosanski Català Čeština Deutsch Ελληνικά Español Eesti Euskara فارسی Suomi Français עברית

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[ 1 ] The basis for JPEG's lossy compression algorithm is the discrete cosine transform (DCT), [ 9 ] [ 10 ] which was first proposed by Nasir Ahmed as an image compression technique in 1972

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