Wifi, based on IEEE 802.11, defines interface modes. IBSS, aka ad hoc, mode is collision detect multiple access (CDMA) similar to a tapped ethernet cable. The more common managed mode hosts associated with an AP mode access point is similar to a star configuration of twisted pair ethernet clients attached to a central router. P2P-* modes, aka Wifi-Direct, are an alternative to bluetooth.

IBSS

ad-hoc

for host in CDMA LAN without access point or router

managed

for client host in LAN with access point

AP

for access point in LAN with managed hosts

P2P-*

Wi-Fi Direct

for hosts paired similar to Bluetooth