There are many different takes on how to actually define the word: broadband. The first and most obvious way to define it is a transmission medium that allows for multiple pathways and types of data, far exceeding simple voice communication devices. Simply, put it is the ability to access a variety of data through one connection at a reasonable speed.
Where a phone line severely limits the amount of information it can transmit, a broadband line, which has bandwidth greater than 2 mbps, unlike a standard dial-up connection which will only have 56kbps, can allow for a variety of different frequencies and channels to travel down its wide pathway. This makes it optimal for those who play video games on the Internet or are involved in heavy graphics work that they need to import, send and receive along the information superhighway.
The minimum width of a broadband line has become a matter of debate. While initially, the broadband definition was a line that was greater than 2 mbps in width, other experts began asserting that it should be at least 3 mbps wide. Still others complain that at least 20 would be appropriate. But now, broadband services start as low as 1 mbps, for those who are trying out broadband for the first time. So who really knows what the minimum level of bandwidth is needed in order for it to be called broadband? One thing is certain though. DSL service which an range from 256 kbps capacity on the downstream and upstream side up to 1.5mbps, or even higher, is considered a broadband service as well. So are cable television modems, which have similar speeds. So, in reality anything with greater capacity than a narrow line, like a telephone line, which can only hold up to 64 kbps, is technically considered a broadband service.