"They are fixed length events of one month or less to create consistency. A new Sprint starts immediately after the conclusion of the previous Sprint." - scrumguides.org
You also need to understand that "release" might mean behind a feature flag. Further, while continuous integration is not within the Scrum guide, it is a common practice in Scrum teams. Yes, there is a concept of a sprint goal, but the sprint goal may be a subset of the product goal. You may choose to group increments across sprint boundaries to present to customers independently of the end of the sprint.
You also need to understand that "release" might mean behind a feature flag. Further, while continuous integration is not within the Scrum guide, it is a common practice in Scrum teams. Yes, there is a concept of a sprint goal, but the sprint goal may be a subset of the product goal. You may choose to group increments across sprint boundaries to present to customers independently of the end of the sprint.