Bitcoin mixer is a service that Essentially scrambles your bitcoin address. 

 How it works is: you send the desired amount to the mixers BTC address and it will then distribute the bitcoin to various different addresses that will then target the intended recipient

You may be asking: Why would i need to do this? 

Why cant i just send the bitcoins directly to the intended target? 

Well ill explain certain wallet sites and programs such as Blockchain keep a Permanent ledger of all transactions, so if a thief or hacker of any kind manages to infiltrate or get their hands on that ledger they can find out your bitcoin wallet address and make YOU their intended target 

There’s also different Levels of mixing as well depending on the service 

Smart Mixer for example has Standard pool, Smart pool, and Stealth pool. 

All offering different levels of anonymity of course, if you use a trusted Mixer provided by a website that you trust it should automatically delete all traces of you sending bitcoin through, however to be a bit more sure consider using an Amnesiac OS Operating System which forgets everything after you restart or shut down the computer Tor and other Onion browsers should be fine though!. 

A few more tips to help you mix safely!: 

Never use a bitcoin mixer that asks for personal information such as banking info. 

Never share passwords or other revealing information even in the event an Admin asks for it. 

If the mixing site asks you to sign up find another website or make a secure email such as proton-mail. 

Always be sure to use an Anonymous Browser, and when in doubt get out!, if its too good to be true it most likely is.

For the best bitcoin mixers please seee: http://bitcoin-mixer.pw