Visual meaning of 'injective'? - learn with images, example in daily life

Visual illustration of injective: Of, relating to, or being an injection: such that each element of the image (or range) is associated with at most one element of the preimage (or domain); inverse-deterministic - Image 1

injective: Of, relating to, or being an injection: such that each element of the image (or range) is associated with at most one element of the preimage (or domain); inverse-deterministic - Thumbnail 1

injective: Of, relating to, or being an injection: such that each element of the image (or range) is associated with at most one element of the preimage (or domain); inverse-deterministic - Thumbnail 2

adjective

Of, relating to, or being an injection: such that each element of the image (or range) is associated with at most one element of the preimage (or domain); inverse-deterministic

"Because each student received a unique ID number, the assignment of student names to ID numbers was an injective function. "

math technical function