Reason for Rank drop

[MuhammadSufyan]

1. Manual or Algorithmic Penalty Rank Drop

1.1. How to Diagnose a Google Penalty?
This is usually a big drop in rankings, that happens over-night. If you notice that your site drops more than 10-20 positions on a multitude of keywords, this could indicate a penalty. A big difference between algorithmic and manual penalties is that the first ones are automatic and are usually released with various Google Updates, while the second ones are manually applied by a Google employee. Given the fact that Google made a habit out of making updates without clearly stating it, you should constantly monitor for ranking changes. You know you’ve been penalized by Google if the drop is harsh and swift, and you can see that your site continues to rank on other search engines like Bing or Yahoo.