It is a data type just like integers ,float , structure . All the above mentioned are used to store a variety of data in list values entered can be edited that is it is mutable bt in tuple it cannot be edited I have not that much idea about dictionary .Sorry for that . I hope my answer is useful for you

These are a part of type of Seauences in Python language.

1. List denated by [ ,     ,     , ]

2. Dictionaries denoted by {  ,    ,    , }

3. Tuples denoted by (  ,   ,    , )

All these 3 posess some properties and there are several operations that can be performed on them. 

List can store different data elements no matter of what type. 

Example list1 = [ 1, 2, 3, 5] 

Dictionaries contains a key value pair. 

Example Dict1 = {"fname":"rashi ","lname":"shukla","age":"21"}

Dictionaries, list and tuples are the different kinds of data structures available in python .
As these are among the important topics of python so description about the topics one by one is not possible here so will recommend you to please refer to the official python documentation at python.org and read the stuffs from there.