What is the meaning of High-level?

Taking place or existing at a high level, altitude or elevation.

Of or pertaining to a person of a high social position or high rank within a hierarchy or organization.

Consisting of such people.

Consisting of relatively natural language-like commands and mathematical notations which, after compilation or interpretation, become a set of machine language instructions.

A summary that provides a general overview and omits nearly all details.

Source: wiktionary.org