The term "eSIM" means an embedded SIM card. It allows you to activate and use a tariff plan from your carrier without having to insert a physical SIM card.
WiFi Map eSIM is installed on all eSIM compatible devices and provides you with mobile internet access in over 60 countries.
NOTE: WiFi Map eSIM is for mobile data only. It does not have a phone number. So you can't use it for offline calling, but you can switch between an eSIM and a physical SIM at any time.