What does the "no command" screen mean? (Trying to execute hard reset Recovery)

I'm trying to hard reset a Motorola XT1058 I inherited from my sister that's sending me to the No command screen. When I press the all of the Power + VolUp + VolDown for a while and release which takes me to the AP Fastboot Flash Mode screen, which reads as follows : AP Fastboot Flash Mode (S) 30.BE (sha-34b7ccb, 2015-04-22 12:57:17) eMMC: 16GB Sandisk RV=06 PV=07 TY=17 DRAM: 2048MB Hynix S4 SDRAM DIE=4GB Up Time: 3 minutes Device is LOCKED. Status Code: 0 Battery OK Connect USB Data Cable Boot Mode Selection Menu Vol Up Selects, Vol Down Scrolls Normal Powerup Recovery Factory Barcodes BP Tools ------------------ Fastbook Reason: Key pressed I then navigate to Recovery and that takes me to the No Command page. What exactly is this No Command page about? I wonder if it's related to the Device is LOCKED message that shows up in the Flash Mode screen? My sister does have a password enabled on the device. Maybe she has to first disable it?