In Salesforce Lightning component the flexiPage Represents the metadata associated with a Lightning page. A Lightning page represents a customizable screen made up of regions containing Lightning components.
A Lightning page region can contain upto 25 components.
Lightning pages are referred as FlexiPages in API and referred as Lightning pages elsewhere in SFDC documentation.
FlexiPage. Represents the metadata associated with a Lightning page. A Lightning page represents a customizable screen made up of regions containing Lightning components