C++ TCP client, can't understand connect() function argument?

Question

linux

There is a small TCP client, everything is more clear in it, except for the line

connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));

I can not understand why not just write?
connect(sockfd,serv_addr, sizeof(serv_addr));
What does it mean?
(struct sockaddr *)&serv_addr
PS: Do not judge strictly, I'm just a user who wants to understand how and what works, I could basically just remember how to write correctly and that's all, but I want to understand the code perfectly ...

Answer 1

If you want to understand code perfectly then learn C++

Answer 2

(struct sockaddr *) - cast to pointer to struct sockaddr