Data communication refers to the movement of encoded information between two devices via electronic transmission systems, either wired or wireless. The basic elements of data communication are sending and receiving devices, communication devices like modems, and transmission mediums. There are two types of communication networks - wired and wireless - and effective data communication depends on delivering accurate information in a timely manner according to the transmission mode, whether simplex, half duplex, or full duplex.

1. DATA COMMUNICATION :
• Data communication refers to the movement
of encoded information from one point to
another by means of electronic transmission
system .
• It can also be defined as the exchange of data
between two devices via some form of
transmission medium which can be wired or
wireless .

2. BASIC ELEMENTS OF DATA
COMMUNICATION :
• Sending Device .
• Receiving Device .
• Communication Devices .
• Transmission Medium .

3. TYPES OF COMMUNICATION :
There are basically two types of
communication networks :
1. Wired Network .
2. Wireless Network .

4. PROPERTIES OF GOOD
COMMUNICATION SYSTEM :
The effectiveness of data communication
system depend on the following
characteristics :
1. Delivery .
2. Accuracy .
3. Timeliness .

5. DATA TRANSMISSION MODES :
There are three types of data transmission
modes . They are :
1. Simplex Mode .
2. Half Duplex Mode .
3. Full Duplex Mode .