Grade 4 | Science | Means of communication, Transport and Communication, Olympiad, CBSE, ICSE, SOF, ITO
The process by which we convey our messages or express our feelings to others is called communication.
Devices used to convey or receive messages are called means of communication. We use means of communication in our daily life like News Paper, Telephone, Mobile, TV, Internet etc. They play important part in our day-to-day activities.
Means of Communication in old times :
In ancient age pigeons and other birds were used for sending messages. This was the slow and unreliable mean of communication.
Means of communication in the modern era :
Telephones and mobiles are most commonly used means of communication. They are among the fastest means of communication. They are used for private two-way communication.
Mobile phones are portable and can be carried away anywhere. They have become popular over telephones.
private communication: When the message is delivered only to the person you are communicating with and his message is delivered only to you.
public communication: When the message is delivered to a wider audience. It is generally used in mass communication. It is a one-way communication where message flows from sender to audience only.
Two-way communication: When two parties communicate by exchanging messages. e.g. Telephone, mobile, chat etc.
One way communication: When a party delivers a message to another but does not receive or intend to receive messages from the audience.
STD (Subscriber Trunk Dialing) services for talking to people in one country
ISD (International Subscriber Dialing) services for talking to people in different countries.
SMS: Short message service
Letters or posts :
Letters is another means of communication. Postcards, inland letters, posts, speed-post etc. were very popular few days back. These are usually hand-written. For quick and very urgent messages there was telegram service. Telegram service has been stopped now. With the rise of internet letters or written posts have become less popular.
Chats, Messengers, Video chats, emails:
With the rise of internet chatting applications, messengers like WhatsApp, video chat apps like Skype and emails like Gmail have become quite popular. There are social media apps like facebook which can be used to connect to many people at the same time.