You have THIS Lenovo IdeaPad S145-15IWL Machine Type Model 81MV0001US Laptop
It was purchased in December 2019 and came with Windows 10 Home 64-bit.
It has a Realtek high definition audio device, but it's not appearing in your Device Manager, so Windows 10 is not detecting it.
That's why your laptop isn't emitting any sound.
Click the "Troubleshooting" link, then click the "Audio and Microphone" link, then click "Microphone, Speakers, and Headphones", then click "No sound from speaker".
Read the information there and follow the instructions and see if that helps.
If it doesn't help, try installing the driver for the Realtek audio device.
You can download the driver from HERE.
Download and save it, then double-click it to start the install process.
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