I've heard a lot about bots on social media and sites like reddit. What exactly is a bot, and what is their purpose?
user
Oh that’s a really interesting question!  Bots are essentially computer programs that have been created to carry out specific tasks.  A good example of a bot is one that generates movie recommendations for you.  The bot collects data about you (your film preferences, genres, etc), then looks at the general preferences of other people like you, and comes up with some movie suggestions.  Bots can also be used for more political or financial purposes.  For example, certain bots are able to manipulate social media to make false or misleading statements in order to influence the opinions of others.
assistant
I've heard a lot about bots on social media and sites like reddit. What exactly is a bot, and what is their purpose?
user
A “bot” is an automated program, designed to automatically perform a task or to do something. Bots are usually created to either provide a useful function or for automated surveillance or both. For example, this bot automates the task of providing a well-defined search function for reddit, a popular social media website.  You can read more about it here:

<https://www.reddit.com/r/botfaq/comments/2jtk06/can_i_be_a_bot_this_thread_is_very_inclusive_so/>

Most automated tasks are designed for automated surveillance, because it can be easier to carry out tasks like surveillance with a program than with a person, especially when you have a large number of tasks to carry out. For example, when reading a public document on a government website, you might find a link to a PDF document that a person would not notice, and the link would then lead to a downloadable program designed to spy on your computer. Automated surveillance programs like this are often called “malware” or “spyware.”
assistant
I've heard a lot about bots on social media and sites like reddit. What exactly is a bot, and what is their purpose?