Summary

In computer systems, data is stored in various units, each representing a different amount of information. The smallest unit is a bit, represented by the symbol "b," which can be either 0 or 1, like a light switch being off or on. Next is a byte, symbolised by "B," which consists of 8 bits. A byte can represent a single character, like the letter "A."

Moving up, we have kilobyte (KB), which is about a thousand bytes, suitable for a short paragraph of text. Megabyte (MB) comes next, equal to about a million bytes, enough to store a few minutes of music. Then there's gigabyte (GB), about a billion bytes, suitable for large files like movies. Terabyte (TB) follows, with a trillion bytes, ideal for massive data sets. Lastly, there's petabyte (PB), symbolized as "PB," with approximately a thousand terabytes, commonly used for vast storage needs like big data analysis.

Remember, as we move up the units, the storage capacity increases significantly, allowing computers to handle more extensive and complex data.