Many search engines are now using Robots or Spiders to gather web pages content information. There are some search sites that are still using human effort to are still been indexed manually. But I think their days are numbered.
The actual content of your site is very important in search engine indexing and also to your visitor. Therefore it is wise to use as many terms as possible that describe your post of topic. There more keywords you have the more effective it is for the search engine to match it with a search.
Your website content must also be interesting enough to keep your visitors from coming back to your page. Some website bore their visitors to death; they will never come back to your site again.
Put yourself in your visitor shoe. What do you think they are interested to find out about your site?