What is executive privilege? Does a former president still get it?

What is executive privilege?
Presidents have been fighting with Congress for all of US history about the concept of executive privilege.
The executive in question is the president and the privilege is his or her right to get honest advice in private and protect it from Congress and the courts.
The term "executive privilege" dates back to the Eisenhower administration, but fights over the separation of powers have been going on for centuries in the US.
Barack Obama invoked executive privilege to shield his Department of Justice from accountability for the Operation Fast and Furious gun tracking scandal.
George W. Bush invoked executive privilege to shield his aides from accountability for the mass firing of US attorneys.
When questions of executive privilege are taken up in the courts, they take forever.
Trump's White House had an expansive but inconsistent view of privilegeTrump initially used executive privilege to hide special counsel Robert Mueller's report on the Russia investigation from Congress and the public.
Neither of those ultimately worked, but they were part of an attempted expansion of executive privilege.
Not satisfied simply with privilege, Trump's lawyers later argued he was also entitled to "total immunity."
Richard Nixon worried he weakened executive privilege with his repeated attempts to invoke it.
Biden rejects Trump's privilege claimPresidents usually try to help each other out on executive privilege and defend each other's claims after they've left office.