Please can anybody explain me the following things below::
1.What is a hashmap
2.Its use
3.What do we do to avoid collisions....

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Isn't that all explained in your textbook?

can u please refer a link.....

don't you know how to use google?

I'll also link you directly to here. A hashmap by definition is almost surely implemented using a hash table, but mapping data structures also commonly use balanced binary search trees (red black being the most popular for this purpose).

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