Bandwidth, measured in bits, are grouped in bytes to construct text and other information that’s relayed between the computer and the internet. Every stored character is equivalent to one byte. One GB (Gigabyte) is the same as 1,024 megabytes, or a million kilobytes, this is about the size of one full-length movie.
Traffic refers to the total number of bits being transferred over the network connection at any given time. Comparable to highway traffic, the speed of data transfer on the internet is greatly dependent upon the amount of traffic generated by all users who are sharing the same connection. When there are many users transferring data at the same time, the traffic can become very slow to allow each client to perform transfers.
Increasing the bandwidth broadens the internet highway and lets more traffic move faster.
Whenever someone visits your site, it’s considered traffic.