You can find materials on the ppt website.

There are many red theme backgrounds and pictures.

Pictures refer to flat media composed of graphics, images, etc. There are many formats for pictures, but generally they can be divided into two categories: bitmap and vector graphics. Commonly used formats such as BMP and JPG are bitmap graphics, while graphics in SWF, CDR, AI and other formats are vector graphics. Things with form, what we see, are pictures, photos, rubbings, etc. collectively. Drawing is a basic term in technical drawing, which refers to a form of describing the geometric characteristics, shape, position and size of things using points, lines, symbols, words and numbers. With the development of digital acquisition technology and signal processing theory, more and more pictures are stored in digital form.