Associative Array

What is the difference between a normal and an associative array with the help of an example. can i get the explanation on the same?

(Moved from knowledge base.)

An associative array links one set of unique values with another set of values (not necessarily unique). Think of an associative array as a two column table. An array is just a set of values. Think of a regular array as a single column table. I also know associative arrays as "dynamic arrays" in ObjectPAL, a "lookup" table in DBA terms, and dictionaries or HashTables in C#. You didn't say which language you wanted an example in so here's an example in C#:

Hashtable MyHTable = New HashTable();

MyHTable.Add("Milpitas", 95035);
MyHTable.Add("Citrus Heights", 95610);