There are some exceptions to that, the AM4 socket my system uses for example has been used for quite a long time. I could upgrade my R7 3700x CPU to something l

There are some exceptions to that, the AM4 socket my system uses for example has been used for quite a long time. I could upgrade my R7 3700x CPU to something like a much newer R7 5800x without changing the motherboard. Intel on the other hand seems to change sockets basically every CPU generation, making significant upgrades more difficult.