Is it programmed using Arduino? I was thinking of using a thermistor to shut off the AC motor once it gets too hot as a food processor keeps working for a certain time frame. And also use a timer once one of the buttons are pushed to have a countdown to show how long its working for? If someone could guide me on what languages can be used to do this and if Arduino can be used to do this.
Sure, an Arduino can do that. Start looking at the example sketches that ship with the IDE, follow the tutorials and examples on this site.
Arduino is programmed in the C/C++ language.
Two people are about to tell you that Arduino isn't used for commercial applications very much.
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Mine is programmed in hardware -- I have a knob and buttons wired to the motor. Over-temperature for safety is often handled with a thermal fuse. I replaced the thermal fuse on my Instapot last month.
Here's an Arduino project for a countdown timer controlling a light: Arduino Project Hub
Almost never. Some appliances, like toasters, use a dedicated chip designed to control a toaster. Some use nothing but electro-mechanical stuff like switches and thermostats. Safety is generally controlled by a thermal switch or a "thermal fuse". The more complicated appliances with a digital display, like a Instant Pot, would use a microprocessor but it is unlikely that the processor would be Arduino compatible. And even if it was you would have to reverse-engineer the programming to figure out how to control each part (lights, heaters, sensors, displays...).
You can, in many cases, rip out whatever control hardware there is and have an Arduino control things. You could add a timer and a display to your Arduino. You could add temperature sensors. You can do anything by replacing the control hardware,
but you probably can't change how the existing control hardware works.
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Most likely not. Commercial product designers use professional development systems.
But it can be used for home appliances I would assume right? Like a typical food processor at home?
Be sure you have at least one spare food processor!
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And several spare Arduinos.
...and a lot of spare time
Like I said: You can probably remove the existing controls and use an Arduino to replace them. For example, an Arduino with a relay module can replace an internal switch in the food processor to turn it on or off. Adjusting the speed of an AC motor is quite a bit more complicated if your food processor has a speed knob.
As a hobby project, you may strip out your simple blender to locate the electrical wirings of Buttons for speed control and of thermistor for over-heat protection. Make a digarm on a piece of paper and post it here. You might get help on how to incorporate an Arduino UNO here to operate the blender.
I would expect any appliances to use a less expensive chip, when you make thousands of something you can spend the extra engineering resources to save a few cents per unit.
Many appliances with a 2-prong plug are double-insulated for safety, so they use non-isolated circuitry and transformerless power supplies.
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