In Aura Components you need to export apex method in apex class using @AuraEnabled annotation. In Lightning web component, you need to export as well as import apex method.
Syntax of import method ->
Now to call apex from LWC, first you need to export a method. exporting is similar to Aura Components. Method should be public/global and static and annotated with @AuraEnabled.
Imported methods can be called using three ways:
Wire a property
Wire a function
Call a method imperatively
1. Wire a property:
if an method is annotated with @AuraEnabled(cacheable=true), you can invoke method from js file in LWC.
2. Wire a function: