Apologies in advance for what is probably a stupid question but I am not tech-ie and have no understanding of routers, access points or whatever they are. Indeed what is the difference?! I have a Tele

I have a TL-WR940N router which is connected to my Deutsche Telekom Speedport and for the last 3 years has been working perfectly until 2 days ago when I’m suddenly unable to get the internet. Light s