What is the apply Method?

app.js

@@ -1,7 +1,7 @@
-let person1 = {name: 'John', age: 22};
+function introduction(name, profession) {
-let person2 = {name: 'Mary', age: 26};
+    console.log('My name is ' + name + ' and I am a ' + profession + '.');
-
+    console.log(this);
-let sayHi = function() {
+}
-    console.log('Hi, ' + this.name);
+introduction('John', 'student');
-};
+introduction.apply(undefined, ['Mary', 'Lawyer']);
-sayHi.call(person1);
+introduction.call(undefined, 'James', 'artiest');