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# Graph # Graph
In computer science, a graph is an abstract data type
that is meant to implement the undirected graph and
directed graph concepts from mathematics, specifically
the field of graph theory
A graph data structure consists of a finite (and possibly A graph data structure consists of a finite (and possibly
mutable) set of vertices or nodes or points, together mutable) set of vertices or nodes or points, together
with a set of unordered pairs of these vertices for an with a set of unordered pairs of these vertices for an

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# Hash Table
In computing, a hash table (hash map) is a data
structure which implements an associative array
abstract data type, a structure that can map keys
to values. A hash table uses a hash function to
compute an index into an array of buckets or slots,
from which the desired value can be found
Ideally, the hash function will assign each key to a
unique bucket, but most hash table designs employ an
imperfect hash function, which might cause hash
collisions where the hash function generates the same
index for more than one key. Such collisions must be
accommodated in some way.
![Hash Table](https://upload.wikimedia.org/wikipedia/commons/7/7d/Hash_table_3_1_1_0_1_0_0_SP.svg)
Hash collision resolved by separate chaining.
![Hash Collision](https://upload.wikimedia.org/wikipedia/commons/d/d0/Hash_table_5_0_1_1_1_1_1_LL.svg)
## References
[Wikipedia](https://en.wikipedia.org/wiki/Hash_table)