What is trackback?

I want to know what is the meaning of trackback? I am new and started writing blog 2 days back only. Today when I was checking the traffic details of my blog, I got to know that 2 of the visitors used the link https://www.mywebsitename.com/trackback after visiting my website and hence, please let me know what is the purpose of using ‘/trackback’ after my website domain name? Also, is it good or bad? Should I disable this feature, if it is bad?
Apologies for asking too many question regarding this, but I have no idea what this is as I came across this term for the first time in this context.