The paper explains how personal assistants work and what are the fundamental differences in the algorithms they use and in what ways we can use personal assistants. The paper focuses on the comparison of two personal assistants, Siri and Bixby, which are used in Apple and Samsung smartphones. The basic use of personal assistants through smartphone interaction is described. The way in which each personal assistant arrives at the answer to the question that the user asks or the command that the user gives to the personal assistant is shown. The comparison of the two personal assistants is shown in a table where the same possibility or functionality is compared through the available literature and sources, and a rating is given in the form of an x sign, which indicates that the other personal assistant is better than the one that received a rating of x, and the personal assistant that is better at something than another gets a tick mark. A visual demonstration of personal assistants and their capabilities is shown through a several-minute video where 34 identical voice commands are given and the personal assistants' responses to those voice commands are shown. In the future, personal assistants will be integrated into every smart device that will surround people during their daily busy lives, and more advanced versions of personal assistants that are not available to the public today will certainly be used. The goal of personal assistants is to make it easier for us even the smallest things that can affect our daily life, thereby saving time and money of their users who will demand that personal assistants can carry out increasingly complicated tasks and commands. Today there are dozens of popular personal assistants on smartphones, and it is good that there is not a monopoly of a few or one, because competition in technology is what forces big companies to improve and at the end of the day the user is better off. Each personal assistant has positive and negative sides, and it is up to the user to determine which is the best personal assistant for him.