look /lʊk/ (n):

# [appearance] [countable] the way somebody/something looks; the appearance of somebody/something.

Looks can be deceptive.

a fabric with the look of silk

Use high-quality paper to give your CV a more professional look.

I don't like the look of that guy (= I don't trust him, judging by his appearance).

by/from the look(s) of something/somebody: It's going to rain today by the look of it (= judging by appearances).

interface /ˈɪntəfeɪs/ (n):

# (computing) the way a computer program presents information to a user or receives information from a user, in particular the layout of the screen and the menus.

the user interface

# (computing) an electrical circuit, connection or program that joins one device or system to another.

the interface between computer and printer

# ​interface (between A and B): the point where two subjects, systems, etc. meet and affect each other.

the interface between manufacturing and sales.