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think of a basin n jug concept.
basin --> network
jug --> diode
water --> current
force of water --> voltage
now, the jug is kept in basin which both are empty (just imagine). u supposed to fill the basin thru jug. i.e., u keep the water pipe into jug. as soon as the jug fills completely, water overflows into the basin and basin space starts to fill with water.
** water does'nt goes into basin untill unless first filled completely by jug.
the same is the case with voltage ax diode also. the diode need to be forced bya min of 0.7 V(si) to allow the current to be passed thru it.
** the diode is empty, which must fist be given a +ve 0.7 volts