PDF is a portable document format. It can combine text, graphics, tables, and other elements inherent in documents. Its peculiarity lies in its versatility - no matter what program the user created the original document, it can be converted to PDF with full preservation of the structure.
This format is widely used as a means of exchanging electronic documents between people and organizations and is also popular in printing. To view PDF files, Adobe has released a free program called Adobe Reader.
In addition, PDF has built-in document security with encryption and digital signatures. All this together with high multiplatform compatibility contributed to the growth of its popularity.
Graphic format PNG (Portable Network Graphics) is one of the most well-known and common raster formats. It is widely used in web design, in particular for creating small elements with a transparent background. This format was created to replace the GIF. And although it did not inherit the possibility of animation, it solved another problem - the need to pay for a license. The PNG format is completely free of patent rights.
PNG format is widely used to work with sites on the Internet, as well as in classical graphic editors. You can edit files with the .png extension in almost any image processing program. Other advantages include the ability to save a file without loss of quality, the admissibility of multiple processing, support for a large number of colors, and support for the alpha channel (transparency).