What does a vpn use to ensure that any transmissions that are intercepted will be indecipherable?

The final idea is to have five different tags, each of them focused on a different aspect of VPN’s. The first one will be a general VPN FAQ where we answer questions like these, the second will be a VPN Review batch which will focus on reviewing the most popular programs, the third will cover VPN Setups, the fourth one, will be oriented towards VPN troubleshooting, while the last will be a VPN Recommendation cluster that will summarise our toughts.