Amazon's cloud services unit AWS is struggling to recover from a widespread outage that knocked out thousands of websites along with some of the world's most popular apps - Snapchat and Reddit - and disrupted businesses globally.

The turmoil marked the largest internet disruption since last year's CrowdStrike malfunction hobbled technology systems in hospitals, banks and airports, and highlights the vulnerability of the world's interconnected technologies.

After more than nine hours of disruptions, some applications were gradually coming back online as of 1pm ET (4am AEDT on Monday).

But AWS acknowledged that elevated errors were still affecting several AWS services and that it was working on recovering connectivity.

Lambda, one of AWS's computing services, was experiencing errors due

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