Apple hosts a dedicated webpage on its website to share product feedback:
Use the above link to share general product feedback with Apple regarding various hardware and software products.
If that doesn't suffice your need, and you'd like to either report bug(s) or request new feature(s), you can do so via dedicated bug reporter here:
You'll need to log in with an Apple ID to do so.
Bug Reporter is preferred, as the concern will be directed to the relevant product team, and you'll most likely get a feedback regarding the status from them.
Also, a new feature request or a bug fix is most likely to happen, contingent to the number of unique bug reports filed. So, Bug Reporter is preferred over Product feedback page.
Filing a bug report is termed as filing a Radar in Apple.
P.S.: There's an official webpage outlining recommended best practises when sharing product feedback and bug reports with Apple. The same can be accessed here: