Computers allow for easier communication and accessing information through the internet. They can be used to advertise, sell products, chat, make phone calls, and share information across locations. Computers also provide a digital solution for creating plans and storing data instead of using paper. Information technology deals with using technology to manage information, including acquiring, processing, storing, and distributing various types of digital data through computing and telecommunications. Key fields include web technologies, bioinformatics, cloud computing, and large knowledge bases.

1. Why we use computer?
As an easier resource to things such as, communication. Through all
types of communication (via internet) we can advertise, sell, chat, phone
calls, location to location and many other things. Computers also are an
easy solution for drawing up plans/data instead of by hand.
My computer serves as an entire library at my fingertips. Just about
everything I want to know about, I can find something about on my
computer. When someone tells me something or hear something on TV
(or asks a question on Answers.com) that makes me wonder, hmm... I
just look it up and see what facts and information I can find about it. I
can usually find what I need pretty fast, and no dusty books to handle.
Why we need it?
Information technology (IT) is concerned with technology to treat
information. The acquisition, processing, storage and dissemination of
vocal, pictorial, textual and numerical information by a
microelectronics-based combination of computing and
telecommunications are its main fields. The term in its modern sense
first appeared in a 1958 article published in the Harvard Business
Review, in which authors Leavitt and Whisler commented that "the new
technology does not yet have a single established name. We shall call it
information technology (IT).Some of the modern and emerging fields of
Information technology are next generation web technologies,
bioinformatics, cloud computing, global information systems, large scale
knowledgebases, etc. Advancements are mainly driven in the field of
computer science.