What is the distinction between apex:pageMessages, apex:pageMessage, apex: Message and apex: Messages?

apex:PageMessages: This part shows all messages that were produced for all the components on the present page, introduced utilizing the salesforce styling. This will display both salesforce produced messages and also custom messages added to the ApexPages class.

apex:PageMessage: Apex: PageMessage is a segment that includes single message the page. This is utilized to show custom message utilizing the salesforce formatting.

apex:Message: apex: Message is utilized to show a mistake on just a particular field. It is utilized to enable developers to put handle particular mistakes in the particular area.

apex:Messages: apex: Messages is like apex: Message yet it shows all the errors.