Area codes are for phone numbers. Area codes are the first 3 digits of the phone number. Usually represent the area ppl live in. Example: (213) 555-6666 --> area code 213. Zip codes are for mailing addresses.
Succession is the process by which new community gets established at an area which had been uninhabited. The community which gets established at the site is called climax community. It is the aggregation of changes of species structure in an ecological community over time.
Primary ecological succession is the changing sequence of communities starting with the first biological occupation of a place where there were no living organisms previously. For example, the colonization and the following succession of communities on a bare rock is a case of primary ecological succession. Secondary ecological succession is the changing sequence of communities starting with the substitution of a community by a new one in a given place.