Connection Modes of LEDs Common Cathode(C.C) & Common Anode(C.A)_ Best Embedded Tutorial

To glow an LED we needs to connected it in Forward Bias Condition. 

When we have so many LEDs to connect, then we have two choices for their connection.
1.)Common Cathode Connection Mode (C.C)
     In this mode, all the cathode terminals of LEDs are connected together and finally they are                  grounded.
     Anode terminal may be provided with Higher Digital Logic '1' or Digital Logic Low '0'
     Providing 1 to Anode will put the LED in forward bias Condition thus it will glow.
     Providing 0 to Anode will put the LED in reverse bias Condition thus it will remain OFF.

2.)Common Anode Connection Mode (C.A)
     In this mode, all the Anode terminals of LEDs are joined together and finally they are                  
     connected to V
     Cathode terminal may be provided with Higher Digital Logic '1' or Digital Logic Low '0'
     Providing 1 to Cathode will put the LED in reverse bias Condition thus it will remain OFF.
     Providing 0 to Cathode will put the LED in forward bias Condition thus it will turn ON.