What's the difference between trademark, copyright and patent? Are the three functions the same?

What's the difference between trademark and copyright? Do they have the same effect? Copyright only plays the role of registration, and its greatest significance lies in reducing the burden of proof of the author. Trademarks and patents are different. Once the registration is successful, the certificate in hand can repel opponents and is a powerful weapon to safeguard rights and interests. What's the difference between trademark, copyright and patent? Because trademarks and patent certificates have strong probative effect, entrepreneurs must apply for trademarks and patents in advance before the products go on the market to prevent others from preempting them. In case of cybersquatting, although you can appeal, the procedure is complicated and the cost is high, and many disputes have not been resolved so far. Ask entrepreneurs to give us a lesson. In addition, it is best to do copyright registration's important works. If you don't want to be a copyright registration, you can leave a piece of evidence for yourself in the simplest way, that is, apply for an email address of a well-known company and send a copy of your work to the email address. The time and content on the email will be important evidence when defending rights. Although the legal effect of e-mail is lower than that of copyright registration, and the cost of proof is likely to be higher than that of copyright registration, this method can also be regarded as a regret medicine.