This is a very commonly used 0.1uF (100 nF) multilayer ceramic SMD capacitor. Used for decoupling all sort of IC from power supply. This is a must to use capacitor for your bread board circuits. Place this capacitor in between VCC and Ground of every IC in your circuit. This capacitor has top marking 104 so some times it called as 104 capacitor. This size of SMD capacitor can be hand soldered easily.