Simply put, a Digital Audio Workstation coverts the signal from your mic/interface into visible, editable sound.
The two I suggest using are:
Audacity: https://www.audacityteam.org/download/ -pretty much free to use. Great to start with, easy to understand, a LOT of youtube stuff out there to help you
Reaper: https://www.reaper.fm/download.php -60 day free evaluation period and pretty inexpensive to purchase. –Booth Junkie: Watch/use his series on setting up Reaper for VO. https://www.youtube.com/watch?v=EfZ6UxFujx4&list=PLzEW-dm_vsRvfiH9RVKAJA6Vd2CccnVmn
Kenny Gioia’s “Reaper Mania” is the next to watch. https://www.youtube.com/channel/UCq297H7Ca98HlB5mVFHGSsQ