Your Title-tag and META-tag are simply lines of text inserted into HTML code of each of your web pages. The Title-tag is one of most important pieces of information for a search engine. The Title-tag should describe exactly what web page contains. It should contain keywords, but not repeats, of terms you hope to be found for. It should also be as readable as possible. The Title-tag will be first thing someone sees in a search result.
The Title-tag should be no longer than 70 characters and should contain words and phrases that accurately describe content of a page. Try to make Title-tags located throughout your site unique and relevant. Every word in Title should be contained somewhere on page they are used for. Research has also shown that a strong call to action will usually produce more clicks than a basic description.
The META-tag is used to store information about a web page but is not actually displayed in a web browser. For example, META-tags provide information such as what application was used to create page, a description of page, and keywords that are relevant to page. Many search engines use information stored in META-tags when they index web pages.
As I stated earlier, META-tag information is not displayed in a web browser. However, if you view source code of any web page you will see HTML code behind that page. To see code, simply go to any website using Internet Explorer and click "view" then "source."
NOTE: It's okay to view, but please don't steal someone else's source code. Imagine how you would feel, if someone did that to you.
For quite some time now, META-tags have been focus of a particular field of marketing research known as search engine optimization, or SEO. In mid to late 1990s, search engines were heavily reliant on META-tag data to correctly classify a web page.