General Communication

.    General Communication contains a general message
•    It is informal in style and approach
•    It has no set pattern of communication
•    It is mostly oral
•    Not always for a specific audience
•    It does not involve the use of technical vocabulary or graphics etc

Technical Communication

•   Technical Communication contains a technical message
•    It is mostly formal
•    It follows a set pattern
•    It is in both forms of communication: oral and written
•    Always for a specific audience
•    It frequently involves jargon , graphics etc

 Source: Professional Communication by Malti Agarwal, Pub. Krishna Prakashan Media.