A friendly introduction is a way of introducing oneself to someone else in a warm and welcoming manner. The crossword solutions for the term 'friendly introduction' are 'USER' (4 letters) and 'eco' (3 letters). USER is an abbreviation for 'USER interface, ' which is a graphical representation of a computer system that allows users to interact with the system. Eco is an abbreviation for 'ecology, ' which is the study of the relationships between living organisms and their environment.