More specifically, Sugarcandy Mountain represents Paradise or heaven, a place where, after a long life of toil and difficulty, the animals will live in ease and comfort. At least this is what Moses says, and he, as the previous answer has pointed out, is reviled by the pigs. But many of the animals persist in believing in the religious message espoused by Moses, who is a parody of the Russian Orthodox Church, the teachings of which remained popular among Russian peasants long after the Russian Revolution. The fact that Moses is "the especial pet" of Jones is a further parallel, as the Tsar received fervent support from the Church.
Sugarcandy Mountain and Moses represent religion. Moses the raven spreads the gospel of Sugarcandy Mountain, and some of the animals believe it but the pigs try desperately to convince them differently.
Moses the raven tells the animals about a mythical place where all animals go when they die. It is somewhere in the sky.
Sugarcandy Mountain it was Sunday seven days a week, clover was in season all the year round, and lump sugar and linseed cake grew on the hedges. (ch 2)
The animals hate Moses because he does no work and just tells stories, but some of them believe in Sugarcandy Mountain.
The pigs have to be very persuasive and deliberate in order to convince the other animals not to listen to Moses. This is similar to the Russian government convincing people not to follow religious leaders.