blackhat seo and white hat seo many different given below:
Techniques used to get higher search rankings in an unethical manner.
Conforms to search engine designs and involves no deception.
Disapproved by search engines.
Approved by search engines.
Site is eventually banned, de-indexed or penalized through lower rankings.
Results last a long time.
White hat SEO follows the search engine guidelines to promote your business or to optimize your business but when any promotional activities or techniques that do not follow search engine guidelines are black hat seo, and search engine can penalise your website for do so.
White hat seo techniques are legal as these follows search engine guidelines whereas black hat seo techniques are not at all recommended by search engines.
White Hat SEO: It is a type of SEO which follow standards (guidelines) of search engines. With the help of White Hat SEO, your website will rank better on search engines and you will be able to get traffic to your website/blogs.
Black Hat SEO: It is a type of SEO which don't follow the guidelines set by the search engines. Because of it, search engines pennalized your website (SEO).
White hat technique is the process that helps to optimize your website using methods that follow webmaster guidelines. This helps to keep your website safe from any search engine updates. Black hat seo is one that do not follow search engine rules. Following these techniques can risk your website to search engine penalties.