# What are the sparse and dense vector ? I cant undestand ,can you explain to me?please.Why do we use for?

I am new to neural networks, embeddings, etc. I am struggling understanding things like sparse representation, embeddings, and especially sparse vectors. Could you explain these to me? Why do we need this vector? What is it?

A sparse matrix

A sparse matrix is a matrix that is comprised of mostly zero values. e.g

     1, 0, 0, 1, 0, 0
A =  0, 0, 2, 0, 0, 1
0, 0, 0, 2, 0, 0


A Dense matrix

Dense matrices with mostly non-zero values, which are referred to as dense matrices.

e.g.

     1, 1, 3, 1, 4, 5
A =  0, 1, 2, 0, 1, 1
1, 0, 0, 2, 1, 1

• what do we use for? – Tugba Ozkan Apr 29 '20 at 16:13