Route groups in Laravel let you group routes that share common settings like URL prefixes or middleware. You define a group with Route::group and pass attributes like 'prefix' and 'middleware'. Then, inside the group, you define routes normally. Each route automatically gets the group's prefix added to its path and the middleware applied. This helps keep your routes organized and avoids repeating the same settings for each route. For example, a group with prefix 'admin' and middleware 'auth' will make routes like 'dashboard' become '/admin/dashboard' and require authentication. The execution table shows how the group attributes apply step-by-step to each route defined inside the group.