the meaning of "save the date "?
i read this phrase in a document and didn`t understand it`s meaning, can anyone explain it to me?

Question

Answer

It is used to let you know of an important event so that you do not make other plans on that date,

Answer

It means "reserve this date."

For example. Someone can send a wedding invitation for a wedding scheduled to occur on 10/1/2016.  "Save the date" means please remember to not schedule anything else on this date.