The successful launch of the satellites takes ISRO's tally of launching foreign satellites to 35. ISRO started putting into space third-party satellites for a fee in 1999 on its PSLV-C2 rocket.
Since then India has been successful in launching medium-weight satellites for overseas agencies. Initially ISRO started carrying third-party satellites atop PSLv rockets as co-passengers of its own remote sensing/earth observation satellites.
In 2007, ISRO for the first time launched an Italian satellite - Agile - as a standalone for a fee.
India began its space journey in 1975 with the launch of Aryabhatta using a Russian rocket and till date, it has completed 102 space missions.
Interestingly the PSLV is carrying seven satellites for second time after having done so in September 2009.
However, the highest number of satellites put into orbit in one go by the PSLV rocket - 10 - was in April 2008.
Two of the SARAL satellite's payload (ARGOS and ALTIKA) has been supplied by the French National Space Agency CNES while the solid state C-band transponder is from ISRO.