Yes, some Windows 10 themes mimic the look of Windows 7.
Yes, some Windows 10 themes mimic the look of Windows 7.
You're referring to what part of Windows 7 feels familiar—maybe the start menu or icons? The overall interface? It's about which elements remind you of Windows 7. If it's just the start menu, stick with the classic shell. Otherwise, most of it needs additional software to run smoothly.
In the window's personalization options you can adjust various elements to revert back to the aero theme (the visual style for Windows Vista and 7), moving away from Metro (the design for Windows 8 and 10). If you need guidance, you can search online for "how to enable aero theme on Windows 10."