Selling technique is the body of methods used in the profession

Profession

A profession is a vocation founded upon specialized educational training, the purpose of which is to supply disinterested counsel and service to others, for a direct and definite compensation, wholly apart from expectation of other business gain....

 of sales

Sales

A sale is the act of selling a product or service in return for money or other compensation. It is an act of completion of a commercial activity....

, also often called personal selling.

Techniques in use in selling interviews vary from the highly customer centric consultative selling to the heavily pressured "hard close".

All techniques borrow a bit from experience and mix in a bit of guesswork on the psychology

Psychology

Psychology is the study of the mind and behavior. Its immediate goal is to understand individuals and groups by both establishing general principles and researching specific cases. For many, the ultimate goal of psychology is to benefit society...

 of what motivates

Motivation

Motivation is the driving force by which humans achieve their goals. Motivation is said to be intrinsic or extrinsic. The term is generally used for humans but it can also be used to describe the causes for animal behavior as well. This article refers to human motivation...

 others to buy something offered to them.