system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't I use multiple connections simultaneously to speed up my internet access?

e.g. If I'm connected to broadband/cable but am near a wifi hotspot at the same time.
gpt
You can, but you need some advanced gear to pull it off. This is called Internet Bonding - Or aggregation. You need a routing device that will pickup both signals and them bond them together. This type of device is fairly expensive, and you are not likely to get the results you are looking to achieve. It doesn't join them so you get a faster speed, say in the case of downloading a big file. What it would allow is for you to have a big file downloading, and then be able to play an online game at the same time.

For true bonding, it has to be bound on both ends. This is generally done with T1 lines, and is true bonding, where 1.5Mbps + 1.5Mbps becomes 3Mbps.

In the scenario you describe, you would end up with two connnections, one wireless, one wired, and your requests to the internet would take the path of least resistance, but it won't join them to increase the overall speed.