Data codes in printing:

An example of data coding would be through print cartridges. Print cartridges are labelled by an abbreviation of their colour for example pink is PK and black is BK. This is a standard used within printing and is seen in an example of a picture below. This is useful for the business because it means that data can get entered and searched for much quicker than if it was the full word. An example scenario being someone going into a store and asking for pink ink, and the employee types in PK into the search and then can see if there are any in stock. It also helps in validation, in data validation if someone is trying to validate data for example checking each black cartridge before they are sold to make sure they are black, by typing in just BK if it is black or PK if its pink and the wrong colour it shortens the time it would have taken and make its much more efficient than if they were to enter the full word. 

Homework:
One example of data validation would be through logging into a website, it validates the password against the one on the account to make sure that you own it. If entered correctly you log in. Another method would be through setting up the account, when creating a password they have length checkers to ensure that the password is a minimum length to ensure it is safe. You can also get presence check which checks that information has been entered into a field for example your email when signing up to something. Next would be double entry which is when you have to enter the data twice such as a repeat email. If they are not the same then you know you have made a mistake and this ensure that you enter the right email. Finally would be proof reading which is when someone manually checks the data and proof reads it to see if anything is wrong such as a misspelling or two different emails.