Eloquent's `whereTime` method simplifies filtering database results based on a specific time range, making it easy to work with temporal data. It can be applied to any Eloquent model and is used by specifying the column name, expression, start time, and end time. For example, `$posts = Post::whereTime('created_at', '>=', now()->subDay())->get();` retrieves all posts created within the last 24 hours.