What is the meaning of practical task?

What is ripping an audio file? What is instragram? Why is a command line interface so fast? Stop Spending Too Much on Printer Ink Cartridges? How do you get an web page? What are sypnotic charts? Information that you would like to share with your audience but not appear on the slide can be written in the pane? Do you need to leave wireless router plugged in when not in use? Is Data created by a computer system using the ASCII coding scheme can be directly accessed by another computer system using different coding schemes? Why is there confusion about the EIDE and SCSI drive-interface standards? Can a computer start and function without ram and a Hard Drive? How many levels of processing in the encoding process? How many 500 ml bottles equal 1 gallon? What is the term for a website that allows users to access and interact with software from any Internet-connected computer or device? Had your computer stolen need help? How many fifths to one half gallon? What is sequential databse? How many GB is 1332 mb? What are the names of the first computers? What instructs excel to display a value as a percentage by multiplying by 100 and rounding?