In addition to representing data with different data storage methods, computers can also let you add additional constraints on what can be saved. So, for example, you might limit the length of a tweet to 280 characters, even though the computer can store longer strings. There are many places these constraints might be used such as: for an age (integer), only allow ages between 0 and 120 for a country name (string), have a pre-set list of valid country names for a legal name (string), disallow emojis

Julia Evans. Examples of floating point problems. January 2023. URL: https://jvns.ca/blog/2023/01/13/examples-of-floating-point-problems/ (visited on 2023-11-24).

Sean Cole. Inside the weird, shady world of click farms. January 2024. URL: https://www.huckmag.com/article/inside-the-weird-shady-world-of-click-farms (visited on 2024-03-07).

In a computer program, when you save information for later use, instead of putting it in a bowl, you give it a name. The computer then makes a place in its memory with that name, and saves the information you asked it to save. Then you can use that name later in the program to ask the computer what was saved in that spot.