monitor (n)
/ˈmɑnət̮ər/

a computer screen, or the part of a computer that contains the screen

mouse pad (n)
/maʊs pæd/

a small square of plastic that is the best kind of surface on which to use a computer mouse

printer (n)
/ˈprɪntər/

a piece of equipment used for printing documents that you have created on a computer

scanner (n)
/ˈskænər/

a device that copies pictures and documents so that they can be stored on a computer

open (v)
/ˈoʊpən/

to start a computer program or file so that you can use it on the screen

close (v)
/kloʊz/

if a computer program closes, or if you close it, it stops operating and disappears from your computer screen

save as (phrasal verb)
/seɪv æz/

to rename a file or change the location of where you save the file

select (v)
/səˈlɛkt/

to mark something on a computer screen; to choose something, especially from a menu

copy (v)
/ˈkɒp.i/

to make a copy that is the same as the original thing

paste (v)
/peɪst/

to move or copy text into a document from another place or another document

delete (v)
/dɪˈlit/ 

to remove information stored in a computer

insert (v)
 /ɪnˈsɜː(r)t/

to put something into something else, or into a hole or space

merge (v)
/mɜːdʒ/

to combine or join together, or to cause things to do this

helpline (n)
/ˈhɛlplaɪn/

a telephone service that provides advice and information about particular problems

hard disk (n)
/hɑrd dɪsk/

a disk inside a computer that stores data and programs

software (n)
/ˈsɔftwɛr/

programs used by computers for doing particular jobs

CD-ROM (n)
/ˌsiː.diːˈrɒm/ 

a CD that stores large amounts of information for use by a computer

toolbar (n)
/ˈtulbɑr/

a row of symbols (= icons) on a computer screen that show the different things that you can do with a particular program

database (n)
/ˈdeɪt̮əˌbeɪs/

an organized set of data that is stored in a computer and can be looked at and used in various ways

hacker (n)
/ˈhæk.ɚ/ 

someone who uses a computer to connect to other people's computers secretly andoften illegally