technology crossword

1. to pay attention to somebody/something that you can hear
6. the official system used for sending and delivering letters
7. using only 0 and 1 as a system of numbers
8. a thing or an idea that has been invented
10. an electronic machine that can store, organize and find information
13. A person who is owned by another person
15. to remove the plug of a piece of electrical equipment
16. to make pictures, or a picture of something
18. to give somebody/something a particular name; to use a particular name or title when you are talking to somebody
19. an international computer network connecting other networks and computers
20. made to appear to exist by the use of computer software
21. a piece of equipment for talking to people who are not in the same place as you

2. the knowledge and skill that you have gained through doing something for a period of time; the process of gaining this
3. a system for connecting to the internet
4. Scientific knowledge used in practical ways in industry
5. designed to find and destroy computer viruses
6. using sound, pictures and film in addition to text on a screen
9. involving science; connected with science
11. trek a US television series first shown in the 1960s
12. default in a system
14. that allows information to be passed continuously and in both directions
17. to look at somebody/something for a time
18. a series of connected metal rings