Japam means reciting a mantra/namam for certain times everyday. Mantra means - మననాత్ త్రాయతే ఇతి మంత్రః means one which saves you by reciting it.
Everything is possible by Japam, the more you do the more you get benefited. Many people recite it everyday for cetain number of times like 108,1108 e.t.c. They make it a schedule in thier daily life.