Infrastructure as a Service (IaaS)
- Platform as a Service (PaaS)
- Software as a Service (SaaS)


The three different service levels are:

| Acronym |  Name | Description |
| ------- | ------------ | ----------- |
| IaaS | Infrastructure as a Service | The cloud provides the hardware, and the operating system, the customer provides the runtime and everything else. |
| PaaS | Platform as a Service | The cloud provides the hardware, the runtime and the operating system.  The customer chooses the application and provides the software. |
| SaaS | Software as a Service | The cloud provides the hardware, the operating system, and the software.  The client uses the software directly, with no changes or customized to suit their business needs. |


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SAPThe Russian Revolution, Through American Eyes

On the centennial of the start of the Russian Revolution, explore about the tumultuous events of 1917 as witnessed by Americans and other expatriates living in the capital

On a muggy July night in 1917, American journalist Arno Dosch-Fleurot joined the protestors parading along Petrograd’s Nevsky Prospekt when gunshots suddenly rang out. Banners pleading for liberty and freedom crashed to the ground as blood stained the Russian capital’s most fashionable thoroughfare. After diving for cover in a gutter, the New York World correspondent came face-to-face with a Russian officer and asked him what was happening. “The Russians, my countrymen, are idiots,” he replied. “This is a white night of madness.”

Striking workers on the first day of the revolution. (Credit: Fine Art Images/Heritage Images/Getty Images)

There