How do I access my keyboard on my screen?

Excuse me, could you please elaborate on how one might gain access to their keyboard when it's displayed on the screen? I'm having some difficulty understanding the process and would appreciate any clarification you could provide. Is there a specific setting or function I need to enable in order to see my keyboard on-screen? Additionally, if there are any common issues that arise when trying to access the keyboard in this manner, could you also enlighten me on how to troubleshoot them? Thank you in advance for your assistance.