Adobe PDF(Portable Document Format) is THE most commonly used format these days for distributing documents, books, magazines, research papers and many other things digitally, and this is a natural question asked to me by some people that how they can type some text in PDF files(may be for a variety of reasons). For example some of them wanted to fill a PDF formatted form others wanted to add notes to some documents. Here I want to note a point that there are PDF forms that you will find on the Internet ...