S3 is one of Amazon Web Services' (AWS) cloud storage options. It is extremely reliable and cheap, which means a good share of web sites use it to host some of their content (like icons, logos, styling information, JavaScript, photos, etc.). This meme was created when S3 went down for the first time in many years. It pretty much broke the Internet for a whole business day: https://www.theverge.com/2017/3/2/14792442/amazon-s3-outage-cause-typo-internet-server
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