1)This algorithm helps in sequence comparison whether DNA or protein
2) It gives a similarity score which if maximized gives a "maximum match"
3)We get a maximum match by searching for maximum no. of residues that match other sequence by allowing maximum no. of deletions
4)This algorithm is used to find a global ar whole sequence match
5)It is based on matrix method of calculation
For more on needleman and wunsch plz visit http://www.maths.tcd.ie/~lily/pres2/sld004.htm