Bursting allows components of the data center to expand on the fly when there is a peak load and then contract when it has passed. The value of bursting is that it will allow you not to have to design infrastructures for the norm not the worst case, saving capital. The conventional path around this is to build the infrastructure well beyond whatever the peak load may be, wasting even more resources and capital. Bursting solves these problems by having a few spare resources available. Virtual machines can be migrated either manually or automatically.”]
Source: https://www.darkreading.com/database-security/the-value-of-bursting