各種

1. Origins, structure, and basic meaning

• Structure: The spelling is 各種, read as かくしゅ. It refers collectively to multiple categories or types and is used mainly before a noun as a modifier.
• Basic usage: Referring to various kinds of applications appears in 各種の申請, while referring collectively to different kinds of tools appears in 各種の工具.

2. Common pitfalls and similar expressions

• Difference from 色々
  • It is more formal and classification-oriented than the conversational expression for various things.