What is the difference between help and assist?

The terms "help" and "assist" are often used interchangeably, but there are subtle differences. "Help" generally implies providing support or aid in a broader sense and can be used in various contexts, while "assist" tends to convey a more specific, often formal, action of providing support to someone in completing a task. Additionally, "assist" can imply a secondary role, where one supports another who is primarily responsible for the task at hand.