The concept of television has always dazzled the imagination. Who could imagine seeing people in one room millions of miles away right at home? Television has evolved over the years with digital technology that enables engineers to create programs with higher resolution etcetera. Since its invention television has always improved but there have also been some failures. Like any other invention there has to be standards. The most common and only legitimate television standards are PAL and NSTC. These standards are defined by regions on a geographical scale. PAL (Phase Alternating Line) is the standard system mainly used by the European Union. In detail PAL has many different specifications than other standards used by other countries. This mainly has to do with the color (colour) variations. NTSC (National Television System Committee) is the system regulation that the majority of the West Coast use and some on the East Coast. You also have SECAM which is not very different from PAL just a different form of color transmission. What makes each standard different is color transmission. As digital technology advances analogue usage declines, yet each standard still has the same core function and changes as innovative visual technology advances.
There is a lot of information on television standards online by searching: PAL, NSTC or SECAM.