What is the Difference between Arrays & Collection ? What is the structure of Collection

Array : It is an indexed collection of fixed number of homogeneous data elements.
Collection : It is a group of objects as a single entity

S.No	Arrays	Collection
1	Arrays are fixed in size.	Collections are growable in nature
2	It supports only Homogeneous data elements	It supports both homogeneous and heterogeneous data elements
3	There is no underlying data structures like Hashtable, LinkedList ..etc. i.e., there is sorting, searching ...etc predefined methods are not available from API	It supports standard data structures like Hashtable, LinkedList...etc. i.e., there is sorting, searching ...etc predefined methods are available from API