I see it time and again in Google interviews or new-grad hires: The way data structures and algorithms — among the most important subjects in a proper computer science curriculum — are learnt ...

The lack of structure made ... classify as unstructured data is indeed semi-structured, because it contains some classifying characteristics. The Difference Between Structured, Unstructured ...

with an introduction to the connection between data structures and the algorithms they support. Data abstraction. Controlled access structures. Trees, lists, stacks, queues, graphs, arrays, hash ...