Keyword research means you can search keyword for your website using some keyword research tool. i think keyword planner is best keyword research tool.

Keyword research is referred to a practice and procedure practised by search engines optimization professionals and internet marketers to find, research and analyze the actual search words / terms people enter into the search engines when they conduct search on internet.
Keyword research is done so that marketers and SEO expert would be able to identify the best keywords in order to rank their sites in search engines.

Hi,
It is process where you find or collect the best service keywords.
thanks

Keywords research and SEO topics belong here
Adsense / PPC / SEO Discussion Forum

Keyword Research is a process to search keywords relevant to business. Generally, we use Google Keywords Planner to research keywords.

A good Keyword Research is the key for an internet marketer to success. You do keyword research to find keywords that will help you drive traffic to your sites.

You can check this guide The Definitive Guide to Keyword Research

Keyword research is most important part of search engine optimization.. ( SEO)
SEO experts or softwares do keyword research as they find maximum possible keywords related to the website. They Use the (Google keyword planar and word Tracker online tool for keyword research)

Keyword research mean you can search the best keywords for your website with the help of keywords researcher tool.Google Adword is the best tool for this..

my question is this that you r discussing here about keyword reaserch, suppose v start work on website but that website already made, then why we should do keyword reaserch even website already have keywords when it is made?

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Keyword Research
It all begins with words typed into a search box. Keyword research is one of the most important, valuable, and high return activities in the search marketing field. Ranking for the "right" keywords can make or break your website. Through the detective work of puzzling out your market's keyword demand, you not only learn which terms and phrases to target with SEO, but also learn more about your customers as a whole.

You can read here: How To Do Keyword Research - The Beginners Guide to SEO - Moz

Keyword Research is give you some idea on your keyword.
If your website keyword is "Gift" than with the help of diffrent keyword tool you can get that how many people is search "gift" keyword in Search engine.
i am personally use google keyword planner.