Difference between AND & OR

You use ‘and’ when you indicate that, all factors are included: Jack and Jill went up means both went up; However, ‘or’ is used denote a choice, an alternative, or only one. –‘This or that’- Jack or Jill went up means only one of them went up.

Another example:

You can eat apples, oranges, plums and peaches- means that you can eat all of the items.
You can eat apples, oranges, plums or peaches – means you can eat only of the items.
The meaning therefore depends upon the context.

2. ‘And’ is a ‘word’. It is a conjunction to join two similar elements such as two words, two phrases, or even two sentences. However, '&' is a symbol. It is used only in combinations of titles such as Johnson & Johnson, and so becomes part of the title. “&’ is used more in informal writing. It is not much used in formal English as a synonym for ‘and’ and we are required to spell the word ‘and’ rather than symbolize it.