No! Mods are short for modifications, which change the gameplay slightly. They aren't illegal, they just support only the version of minecraft they are compiled for. Jeb is even thinking of adding "Mod Support".
Although, If you are playing on multiplayer servers, you should check the rules because some servers ban certain mods/hacks. Some servers even require you to download certain mods and/or texture packs to log into them (Tekkit servers, etc.)
Chat with our AI personalities
No it is not illegal.
No, Minecraft Forge is not illegal! That is why many people still use mods.
bearshare is not required to get minecraft mods.
Yes, most Minecraft Mods are updatable.
Unplug your hard drive and put it in your computer and get mods for minecraft