PAL SPECIFICATIONS
The PAL (Phase Alternating Line)  standard was launched  in the early 1960's and implemented in most  European countries except for France. The PAL standard utilizes a wider channel bandwidth  than NTSC which produces better picture quality.
PAL  produces 625 lines per frame.  Other  PAL  family systems are: PAL B,G,H - PAL I -PAL D - PAL N & PAL M.

NTSC SPECIFICATIONS
 The first colour TV broadcast system was implemented in the United States in 1953. This was based on the NTSC(National Television System Committee) standard. NTSC is used by many countries on the American continent as well as many Asian countries including Japan. NTSC runs on 525 lines/frame.

SECAM SPECIFICATION
Memory) standard was introduced in the early 1960's and implemented in  France.  SECAM uses the same bandwidth as PAL but transmits the colour   information sequentially SECAM runs on 625 lines/frame.