Every additional component is also run on this thread, unless explicitly instructed otherwise. This thread is in charge of the user interface. When an Android application is launched, a main thread is always created. Let's say you're simultaneously making coffee while cooking pancakes.

Multi-threading is simply a program executing multiple threads at once. For instance, following a recipe to make pancakes in the morning can be considered a metaphorical 'thread'. In programming, a thread is the execution of instructions that can be managed independently.

In order to ensure these things are handled gracefully and in the correct order, we'll need to explore a concept called threading. However, now that we're relying on the Yelp API, we cannot actually display any restaurants until after we've successfully received a response. Previously, we created an ArrayAdapter and attached it to a ListView in the onCreate() method. In this lesson we'll update our MyRestaurants application to display the names of the restaurants received from the Yelp API instead of the hard-coded restaurant array in RestaurantsActivity.

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