Definition
In the context of Scrum, an Increment is an integrated version of the product or service with added functionality, improvements or changes that have been completed during the Sprint. An Increment comes into existence when a Product Backlog item meets the Definition of Done.
If the work does not meet the Definition of Done, it is not part of an Increment. The Scrum Team may not present it during the Sprint Review. Note: the team can deliver multiple Increments during a Sprint.
Each Increment is a concrete step towards the Product Goal. Each Increment must be usable; otherwise, it is not of value. The Scrum Team can deliver an Increment at any time, also before the Sprint Review takes place. The Sprint Review is not intended as a meeting to “release value”.