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GAP and GATT are generic terms used in BLE Spec. Please go through either Bluetooth Core Spec https://www.bluetooth.com/specifications/bluetooth-core-specification/ or any getting started with Bluetooth Low energy .
You may also go through BLE overview given in our getting started documents : https://www.cypress.com/documentation/application-notes/an91267-getting-started-psoc-4-ble
CYSPP is defined in the EZ-Serial BLE Firmware Platform User Guide itself. Please refer 9.2 CYSPP Profile