A more thorough explanation:

A legal notice is a notification that is required by law or agreement, or given by operation of law as a result of some fact. It is a definite legal recognition of an existing right or title. A person has notice of a fact or condition if they have actual knowledge of it, received information about it, have reason to know about it, know about a related fact, or are considered as having been able to ascertain it by checking an official filing or recording.

• If you are renting a house and want to move out, you must give your landlord written notice 30 days before vacating the premises.
• All prospective buyers were on notice of the judgment lien.
• The notice of sale was posted on the courthouse bulletin board.

These examples illustrate how legal notice can be given in different situations. In the first example, the tenant must give written notice to the landlord before moving out. In the second example, anyone who wants to buy a property is considered to have notice of a judgment lien on that property. In the third example, a notice of sale is posted in a public place to inform people about the sale.