A variable is a memory / storage that our program can use to store and manipulate data. Each variable has a specific data type, which determines the size that a variable will occupy in memory.

A dictionary is a collection that stores values in a key value pair, i.e. the data stored in a dictionary is stored in a method where each value is related to a key. Here, every key is unique and cannot appear twice in the same dictionary.

Arrays are the data types that store the same type of data in an ordered list. The same value can appear at multiple indexes/Places in an array.

Swift provides a variety of Control Flow Statements. Loops are generally used to iterate over a condition or statement multiple times, until a Condition / Programmer’s need from that loop is satisfied.

Classes are the general-purpose flexible constructs that are the building blocks of your program’s code.

Object is the term that is generally used to refer to instance of a class, so we can call it instance instead of objects.