title: What is multi tenancy and ways to achive it?
body: <p>I have been reading about multi-tenancy for quite a while. With the very trivial statements like below. I have read dozens of links and sites but all are quite abstract.</p>
  
  <blockquote>
    <p>..In which a single instance of software runs on a server and serves
    multiple tenants.</p>
  </blockquote>
  
  <p>I was quite comfortable in understanding it from above 30000ft but I was not able to comprehend the way it can be implemented. </p>
  
  <p>If anyone can please help me understand with a single stack(just technical) and with an example(may be Salesforce) how do I achieve it and, I would be more satisfied because I am in desperation to know it since almost few days.</p>
  
  <p>Kindly do not post links of Wikipedia or any websites. I have read most of them and yet hunt is on!</p>
  
  <p>I understand this is a very trivial question yet please do not down vote for very few good reasons as you may read some new answers out of this question!</p>