Finding the right keywords, which is an essential part of online marketing and SEO campaigns, can be a simple task when you use reliable keyword research tools available on the internet. Though you may need to pay a price for using the best research tools available, you can also get a few good quality tools for free. Here is a list of the most popular tools you can use for researching keywords.

Google Trends

Google Trends is a very effective tool for finding the latest trends in keyword use. A part of Google web search is analyzed to compute the number of times a keyword has been searched, while a graphical representation is used to display the top cities or regions and languages in which your keyword has been searched. You can also use the ‘Hot Topics’ and ‘Hot Searches’ options on the page for finding the top keywords being used on that day.

Google Search-Based Keyword Tool

Google’s search-based keyword tool looks for relevant user queries in Google search by considering your website’s URL. This keyword research tool takes into consideration the past searches and organizes the keywords into various categories and subcategories. The search-based keyword tool, however, is being replaced by a better version called the Updated Keyword Tool that allows you to identify keywords based on words or phrases, websites and even categories.

Another search-based option for finding keywords is to use Google’s search box itself. When you type in a letter or single word, the search box automatically suggests various
keyword options relevant to what you’ve entered in the box.

Google Adwords Keyword Tool

Among all the keyword research tools by Google, the Google Adwords Keyword tool is the most reliable. The Adwords keyword tool takes in data from Google searches, Google Adsense and Google Adwords. You can search for keywords based on various categories, locations and languages. In addition to that, you can filter the keywords you want to find by including and excluding specific words or phrases.

Google Insights for Search

Google Insights allows you to compare search patterns and trends for relevant search terms. ‘Google Insights for Search’ uses various filters to find the right keywords for specific regions, categories, seasons and also the product or service features.

Wordtracker Free Keyword Suggestion Tool

This is a free keyword search tool that allows you to identify the most often used keywords for your business. It can also provide you with your competitor’s keyword usage information and helps you to determine keywords and phrases with high traffic potential.

Microsoft's Keyword Forecast Tool

This tool by Microsoft forecasts your keyword’s usage count or volume and also categorizes its usage based on age and gender. The search forecast can be viewed in flash, picture or text formats and takes into account seasonality and historical trends for predicting its impressions.

In addition to the above mentioned keyword research tools, you can also try a few more - Trellian's Keyword Discovery, Hitwise for fast moving search terms and Keyword Country that can help you optimize your SEO plan.