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@@ -5061,6 +5061,10 @@ the pseudo table to retrieve the sum of the prices spent by each customer, then
 
 <details>
 <summary>Explain availability sets and availability zones</summary><br><b>
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+An availability set is a logical grouping of VMs that allows Azure to understand how your application is built to provide redundancy and availability. It is recommended that two or more VMs are created within an availability set to provide for a highly available application and to meet the 99.95% Azure SLA.
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+
 </b></details>
 
 <details>