What is the simplest meaning of digital input?

What is the minimum number of wires needed to send data over a serial comm Link layer? Which processor is higher Intel Pentium or Intel Core? Do printers have gears inside? Can you reboot a used computer that you bought from someone? How do you lock the Hard Disk of computer? What is the BDR and DDR? Can internet is making it increasingly easier for people to access any material anywhere in the world and at any time? What is a combination of chart elements that can be displayed in a chart? How much does pay pal express cost? Which method allows you to have common extensions visible when viewing the files? What accessory do I need to connect 2 monitors? What problems and issues does eBay's top management need to address? What are the factors that influence market demand on personal computers? What stores sell computer dust covers? Why doesnt your laptop want to charge it worked for a couple days and all of a sudden it stopped working Also whenever its out of battery a small battery light blinks it doesnt do that no more help? How many milligrams in gallon? How many cubic yards of concete are needed to pour a slab 60ftX80ftx5in thick? Why Microsoft creates soft wares for mac? What are the features of system software? How do you open and run a 7-zip file?