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The fundamental properties of a spinor Bose-Einstein condensate (BEC) are deter mined by both spin-exchange and dipole interactions.The spin-dependent part of the interaction (spin-exchange interaction) is three orders of magnitude smaller than the spin independent one and usually much smaller than the temperature of thesystem.Yet, due to bosonic stimulation, it profoundly affects the properties of the system.Themagnitude of the local spin is primarily determined by the sign of the spin-exchange interaction.The magnetic dipole-dipole interaction is even smaller in magnitude than the spin-exchange interaction; however, it plays a crucial role in forming the spin texture, which is the spatial distribution of the spin orientation, and controls the long-term dynamics of magnetization.