Concatenation involves adding two or more strings together, creating a larger string containing the combined data of those original strings. This is done in JavaScript using the + operator.

var bigStr = "Hi " + "JS strings are nice " + "and " + "easy to add";

{% exercise %} Add up the different names so that the fullName variable contains John's complete name. {% initial %} var firstName = "John"; var lastName = "Smith";

var fullName = {% solution %} var firstName = "John"; var lastName = "Smith";

var fullName = firstName + " " + lastName; {% validation %} assert(fullName === 'John Smith'); {% endexercise %}