A bail bond is a surety bond, which is posted by a bail bond company to the court as a guarantee for an arrestee's appearance at all court dates. The court will release an arrestee from detention upon posting of the bail bond.
Anyone can post your bail bond. Usually you will go through a bail bondsman so you put up a small percentage of the bail, but you forfeit that once the bond a returned. To qualify you need to have credit and collateral. If your bail bond is $100K ...
A bond is posted on a defendant's behalf, usually by a bail bond company, to secure his or her release. Pending Warrant. Defendants with pending warrants are usually not eligible for bail. Bail is not intended as a punishment in itself.
And while some will tell you that you can't remain anonymous, the short answer is actually yes, you can. (But with one major consideration.) The Court is going to need a name and person to return the bond to once the court date has been successfully completed.
The defendant can post their own bail or ask a family member or friend to post it. If the defendant uses a bond company, the company may require the defendant to have a co-signer (someone who will help the company find the defendant should they fail to appear).
If a defendant cannot afford bail, then at the arraignment or any hearing while still incarcerated the defendant can request a bail reduction or release without bail. That must be supported with evidence that the defendant is unlikely to reoffend or to flee.