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The CPU contains a special set of memory cells known as registers that can be both readable and writable more rapidly than the main memory area. There are typically between two and one hundred registers based upon the type of CPU. Registers are used for the most frequently needed data items to avoid having to access main memory every time when data is needed. Computer main memory comes in two principal varieties: random access memory or RAM and read-only memory or ROM.

RAM can be read and written to anytime the CPU commands it, but ROM is pre-loaded with data and software that never changes, so the CPU can only read from it. In general, the contents of RAM are erased when the power to the computer is turned off while ROM retains its data indefinitely. Generally computers with this sort of cache are designed to move frequently needed data into the cache automatically, often without the need for any intervention on the programmer's part.

Nail polish is a cosmetic lacquer that is applied to the nails of both the fingers and toes, usually as ornamentation but also as protection. Most nail polishes are made of nitrocellulose dissolved in a solvent and either left clear or colored with various pigments.

There are historic records of its use in ancient societies of China and Egypt, where colour signified social class. In China, it is done by mashing together the petals of impatiens flower and alum. Applying this mixture to nails for a few hours or overnight leaves a color ranging from pink to red. nailpolish is shinyOriginally made of natural pigments, modern nail polish is similar to car paint, and requires a polish remover such as acetone to remove. Modern nail polish was invented by Michelle Ménard in the early 1920s.Nail polish should be stored in a cool place, such as a refrigerator, as it will change consistency if left in a warm environment.