Can Anybody Explain What Exactly Is A PDF?

Can anybody explain what exactly is a PDF? A PDF is basically a Portable document format that is used as a file format for documents and other word files. The history behind the invention of PDF technology is vast. Earlier we do our office work on word pad and other documentation applications. But the problem arises that they were not much secure and size of the document increases with the increase in the text in the file so it become difficult to attach those files in the mail and to transfer these documents to another system. To get rid of these problems PDF technology was developed. This PDF technology is such a reliable file format that is platform independent. It works very easily on every desktop. PDF format make the document a new rich look that when we want to show that document in an assembly or meetings it is easy to handle without any requirement to make amendments in that particular document. We can also apply some security rules with the help of some pdf to word converter on the document so that it can be only accessed by the specified users. The main feature of this technology is that it reduces the size of the document, so that we can easily email the file or documents to our friends and colleagues.