Blacklisted
Generally blacklisted means banned or get rid of, usually blacklisted url is the one which has removed from a SERP(Search engine results page), and these banned sites are ignored by search engines. No search engines will prefer this blacklisted sites.

Broken Link
Broken link is commonly known as dead link. It means that broken link will not stay active for longer time. Actually search engines dislike broken links. One important part of ongoing optimization is keeping all of your site's links active, because it is very necessary when search engines finds your site.

Index
An index is a term which refers to Search Engine's database. Because it contains whole information that what crawler has recognized or identified, particularly copies of web pages. when user wants to find information in search engines then search engine uses its indexed pages and algorithm to provide a high ranked list of the most relevant pages. Because of this search engine's database it is ready to provide any information based upon the user query, with most effectively and accurately.

Cloaking:
Cloaking is the presentation of alternative pages to a search engine Spider so that it will record different content for a URL than what a human browser would see. Cloaking is typically done to achieve a higher search engine position or to trick users into visiting a site. In such cases cloaking is considered to be Black Hat SEO and the offending URL could be Blacklisted. However, cloaking is sometimes used to deliver personalized content based on a browser’s IP address and/or user-agent HTTP header. Such cloaking should only be practiced with a search engine’s knowledge or it could be construed as black hat cloaking.

Crawler:
Also known as Spider or Robot, a crawler is a search engine program that “crawls” the web, collecting data, following links, making copies of new and updated sites, and storing URLs in the search engine’s Index. This allows search engines to provide faster and more up-to-date listings.

Delisted:
It is also known as banned or blacklisted, a delisted site is a URL that has been removed from a search engine’s Index, typically for engaging in Black Hat SEO. Delisted sites are ignored by search engines.

Doorway Page:
Also known as a gateway page or jump page, a doorway page is a URL with minimal content designed to rank highly for a specific keyword and redirect visitors to a homepage or designated Landing Page. Some search engines frown on doorway pages as a softer form of Cloaking or Spam. However, doorway pages may be legitimate landing pages designed to measure the success of a promotional campaign, and they are commonly allowed in Paid Listings.

Dynamic Content:
Dynamic content is web content such as Search Engine Results Pages (SERPS) that are generated or changed based on database information or user activity. Web pages that remain the same for all visitors in every context contain “static content.” Many e-commerce sites create dynamic content based on purchase history and other factors. Search engines have a difficult time indexing dynamic content if the page includes a session ID number, and will typically ignore URLs that contain the variable “?”.Search engines will punish sites that use deceptive or invasive means to create dynamic content.

Actually there are three types of SEO Hats:

White Hat SEO
White Hat SEO is also known as organic search engine optimization or natural search engine optimization. White hat SEO is the legitimate use of keyword-focused copy and tags, Search Engine Submissions and a quality Backlinks network to improve sites position, Page Rank, CTR(Click through rate). If site is having a good reputation in search engine postions then it is better to use white Hat SEO techniques instead of black hat techniques. White hat SEO does not include Cloaking, Spam or any other Black Hat SEO techniques. The results which come from white hat techniques are long term.

* No Risk

* User Friendly

* Follow Guidelines

* Long Term Results(It takes Long time to get approved)

Black Hat SEO
In Black hat SEO optimization is mainly done in an unethical manner. This incudes cloaking, spam, violating search engine rules. If a search engine finds a site with black hat SEO techniques then it will remove that site from search engine index. Black Hat SEO techniques can give immediate results but it is very risky. The results will not stay longer and also it effects the site position in SERPs.

* High Risk

* Not User Friendly

* voilating search engine guidelines

* All Scraped Content


Gray Hat SEO
Actually Gray Hat SEO falls in between Black Hat SEO and White Hat SEO. In some cases Gray hat SEO techniques can be legitimate or illegitimate. Such techniques include Gateway Pages, Cloaking ,Doorway Pages, and duplicate content.

* Some what Risk Reward

* Some What User Friendly

* Keeps in Mind (SEO Guidelines)

* Semi Unique

* Less Effort Than WHITE HAT.