Reciting Shree Radha Krishna’s names and singing the glories of their forms, pastimes, qualities and abode is known as sankirtan.
The Ramayan says:
ehī kali kāla na sādhana dūjā
joga na japa tapa vrata makha puja
kaliyuga kevala nāma adhārā
sumiri sumiri nara utarahiṅ pārā
“There is no other method in Kaliyug. Neither yoga, nor austerity, nor yagya, nor worship will take you to your goal. Just sing the glories of God, engage your mind in roopdhyan (loving remembrance) and listen to his glories from the Saints. This is the only means in Kaliyug to attain one’s ultimate goal."
Find out more about the true meaning of Sankirtan in this wonderful video from Jagadguru Shree Kripaluji Maharaj's 2002 lecture in Brahmapur.