Example
● Pickup the nearest phonebook
● Open it to the first page of names.
● We're looking to find the first "Smith". Look at the first name.
● Is it "Smith"? Probably not (it's probably a name that begins with
'A').
● Now look at the next name. Is it "Smith"? Probably not.
● Keep looking at the next name until you find "Smith".
Explanation
– You started at the beginning of a sequence and went
through each item one by one, in the order they existed
in the list, until you found the item you were looking for.