Explain the difference between app.get('/path', handler) and app.use('/path', handler) in Express.js.

In Express.js, app.get('/path', handler) and app.use('/path', handler) are both used to set up middleware, but they are used in slightly different ways.

1. app.get('/path', handler) is a route definition for HTTP GET requests. This means that the handler function will be executed whenever a GET request is made to the '/path' on your website. This is typically used to retrieve or read data from the server.

2. app.use('/path', handler) is a bit more general. It's not tied to any specific HTTP method (like GET, POST, etc.). Instead, the handler function will be executed every time any kind of request is made to '/path' or its subpaths. This is typically used to set up middleware functions that need to do something for every request, like logging or authentication.

In summary, app.get is used for handling GET requests at a specific route, while app.use is used for handling all types of requests at a specific route and its subroutes.