Findstr is a command you can use on your computer that helps you search for specific words or phrases in a text file. It's kind of like when you play "I Spy" and you look for something specific that begins with a certain letter or color.
When you use findstr, you'll type in the word or phrase you want to find, and the command will search through the text file to see if it appears. If it does, findstr will show you the line(s) where that word or phrase is located.
It's kind of like a treasure hunt! You're trying to find the words or phrases that you're looking for, and findstr helps make that easier for you.