What is communication over a network?
A network joins computers, phones and machines so they can share messages. When you send a message, your device cuts it into small pieces called packets. Each packet carries the address of the receiver. Routers read the address and pass the packet on, step by step, until it arrives. The other device puts the packets back together.
Choose the right tool
- Email: for formal, long or important messages. You can attach files. The reader answers when ready.
- Chat: for short, quick talk inside a team. Fast, but easy to miss or forget.
- Video call: for live meetings, showing a machine or drawing, and talking through hard problems.
- Shared files and boards: for working on the same document together.
Writing a clear English message
Use a short subject line that says the point, for example "Drawing for bracket B12 - need approval by Friday". Start with a greeting. Say your main request in the first two lines. Use short sentences and simple words. Say what you want the reader to do next and by when. End with thanks and your name. Re-read the message before you press Send.
Useful phrases: "I am writing to ask...", "Could you please...", "I have attached...", "Please let me know by...", "Thank you for your help."
Good habits and safety (netiquette)
Be polite even when you are in a hurry. Do not type in capital letters; it looks like shouting. Check the address before sending. Do not share passwords or private data. Do not open attachments from people you do not know. On a video call, mute your microphone when you are not speaking and look at the camera.
Try it
Open the 3D and send the same message as email, chat and video call. Which is fastest? Which is best for a long drawing? Then write a 3-line email to ask a friend for a book. Give it a subject, a request and a thank-you.
Key formulas and definitions
- Message = greeting + main point + details + next step + thanks
- Email: formal, can attach files
- Chat: short and quick
- Video call: live, two-way, needs good internet
- Packet = a small piece of a message with an address
Worked examples
1. You need your supplier to approve a drawing by Friday. Which tool is best and why?
Email. It is formal, the drawing can be attached, and there is a written record of the approval.
2. Write a good subject line for a request to move a meeting from Monday to Tuesday.
Request to move Monday meeting to Tuesday, 10 am. It says what you want and when, in few words.
3. A machine is making a strange noise and you want an expert to see it now. Which tool?
A video call. The expert can see and hear the machine live and help at once.
Common mistakes
- Writing a long email with no subject line.
- Using chat for a big, formal decision that needs a record.
- Typing everything in CAPITAL LETTERS, which feels like shouting.
- Opening attachments or links from unknown senders.