A terabyte is how many bytes?

A terabyte is equal to 1,000,000,000, or one billion bytes. This measurement reflects the base-10 conversion where one terabyte is defined as 1,000 gigabytes, and each gigabyte is 1,000 megabytes, progressing down to bytes.

The correct answer indicates that a terabyte is a substantial unit of digital information, often used to measure the capacity of storage devices like hard drives and SSDs. This capacity means that a terabyte can store approximately 200,000 songs, hundreds of thousands of photos, or several hours of HD video, showcasing its importance in the context of data storage.

The other options fail to accurately represent a terabyte's full capacity, either significantly underestimating or overshooting the count of bytes.