[What is Data?]
Data are simply values or sets of values of qualitative or
quantitative variables, belonging to a set of items. It may be in the form of
numbers, letters, or a set of characters. It is often collected via
measurements. In data computing or data processing, data is represented by in a
structure, such as tabular data, data tree, a data graph, etc.
[What is Information?]
Once the data is analyzed, it is considered as information.
In other words, meaningful or processed data is known as information. Example-
Suppose we have a collection of numbers like 23, 25, 87 etc. These can be
called as data. Now if we specified these numbers with an attribute like ID of
some people in a system then they call information. Because this time each
number represents a user identity.
[What is signal?]
In communication or electronic system we need to transfer
information. And that is happened electrically.
In order for data or information to be transferred electronically, it
must first be converted into electromagnetic signals. The signal can then be
used to transfer data from one device to another device. The signal can be
either analog or digital in nature. The analog signal refers to a continuous
stream of data, whereas digital signal converts the data into discrete states
as discus in a post before. But remember that all the part of the signal don't contain information.
Hence, data and signal are two completely different things.
Data is a collection of values in any form . Signal, on the other hand, is used
to transfer this data from one point to another.