Learn in the textbookInfrastructure Foundations of Mobile Communications
DefinitionAn access point (アクセスポイント) is the connection-point device that takes in wireless LAN devices by radio and bridges them to a wired network.
ExplanationIt sits in homes, offices, shops and the like, and devices within range reach the network through it. Each one is identified by a name called an SSID, which you pick from the list your device displays.
AnalogyIt is like an office receptionist, who takes a visitor's (device's) request and passes it on to the staff deeper in the building (the wired network).