AutoCAD is a popular software application for designing and drafting 2D and 3D models. It is developed by Autodesk and requires a product key and a serial number to activate it. If you have purchased AutoCAD 2013-2016 as a standalone product or as part of a suite, you can find the product key and the serial number in different ways.

The product key is a 5-digit code that identifies the specific product and version you are installing. For example, the product key for AutoCAD 2013 is 001E1, while the product key for AutoCAD 2016 is 001H1. The product key also differentiates products that are sold independently and as part of a suite. For example, installing AutoCAD 2013 from the Autodesk Product Design Suite Ultimate 2013 requires product key 781E1.

You can find the product key in one of the following ways:

• On the product packaging or on the label attached to it.
• On the software download page or in the confirmation email if you downloaded it online.
• On the Autodesk Account website if you registered your product online.
• On the Autodesk Product Keys page if you know your product name and version.

The serial number is a unique 11-digit code that identifies your specific license. You can find the serial number in one of the following ways:

• On the product packaging or on the label attached to it.
• On the software download page or in the confirmation email if you downloaded it online.
• On the Autodesk Account website if you registered your product online.
• On the About dialog box of your software if you have already installed it.

To activate AutoCAD 2013-2016, you need to enter both the product key and the serial number during the installation process or after launching the software for the first time. You can follow these steps to activate your software:

1. Start AutoCAD and click Enter a Serial Number.
2. Type your serial number and product key in the fields provided and click Next.
3. Select your country or region and click Next.
4. Select one of the following activation methods:
• Connect now and activate: This option requires an internet connection and allows you to activate your software online.
• I have an activation code from Autodesk: This option requires you to obtain an activation code from Autodesk by phone or email. You need to provide your request code, which is generated by your software, and your serial number.
• I want to activate later: This option allows you to use your software for a limited time without activating it. You can activate it later by clicking Activate on the Help menu.
5. Follow the instructions on the screen to complete the activation process.