Solder paste is a mixture of solder spheres held within a specialised form of solder flux. As the name indicates it has the texture of a paste, and hence the name.
The fact that it is a paste means that it can be easily applied to the board during PCB assembly.
The solder particles are a mixture of solder. Traditionally this used to be tin and lead, but with RoHS legislation has been introduced around the world, to only use lead-free solders. These may be made from a variety of mixtures. One is 99.7% tin and 0.3% copper, whereas there are other mixtures that include other metals including tin.
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