The main difference between chandeliers and pendant lights is that pendant lights are designed to hang vertically from a chain. This emphasizes the length whereas chandeliers tend to be wider and have multiple lights. Putting several pendant lights together creates the effect of a chandelier.
Multiple pendant lights offer greater flexibility in spaces because they are not fixed in size like chandeliers. The size of chandeliers cannot be modified. Rather than shopping for the perfectly sized chandelier to fit a room to scale, which can often be challenging, multiple pendant lights can be sized to fit perfectly depending on the number of lights. They can make the overall light more rectangular or round, longer or shorter and the luminescence can be tailored for a room based on the pendants chosen.