In nature evolution occurs throughout various different things. Also evolution occurs in technology. Take for instance, ATM was an evolution of frame relay, and frame relay was an evolution of packet switching. Evolution happens everywhere but in technology it happens all the time.
Packet switching technology breaks down messages into fixed-length pieces called packets and sent through a network individually. In packet switching messages are segmented into packets of a pre determined size
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Right now frame relay is the efficient source of data transfer, but in the future as multimedia features grow the need for ATM will grow with it as well. Having the best isnít always better. It may cost more than what you want to spend. From packet switching to frame relay to ATM, they all evolved from each other. Taking existing technology and improving it for the time it is needed for.