The difference between ID and Class tags

The difference between ID and Class tags often causes confusion, and can lead to problems during the development of a website.

ID tags can be used to define one only one element within the website, so it defines a unique set of commands. If two or more element are defined with the same ID tag, then this may cause one or both of thhe elements to not obey the commands.

Class tags can be used to define as many elements as is required, however, when the commands are changed, all elements defined with that class tag are changed.