Curcumin is the yellow pigment associated with the curry spice, Turmeric, and to a lesser extent Ginger. It is a small molecule that is the prototypical 'curcuminoid', and has effects similar to other polyphenols but unique in a way as it is a different class of polyphenol (relative to the other classes of 'flavonoid', 'stilbene', etc.)
The most simple definition of virtualization is the creating of a virtual version of something. This could be an operating system, server, storage device, or other resources. One common example would be someone who has divided their hard drive into multiple partitions. Uses.
Data virtualization is used in many applications when data is merged or federated in the application from multiple sources but it is undesirable for the application itself to process data handling complexity.