Why do you need a Landing Page
A landing page is where your web visitors should land when you promote a specific offer, especially when you are paying for these visits (think PPC ads). The tragedy is that business send their ad traffic to their website homepage, which is a bad idea most of the times.
Let us take an example to understand the difference. Imagine you are a fruit seller and want to sell apples, bananas and watermelons online
SELLING 3 FRUITS ONLINE
You setup PPC ads on Google . People search, find your ads, and start clicking.
For Example: Someone searches for a watermelon. Your ad shows up, and clicks begin.