What is the difference between Salesforce System.Assert and System.AssertEquals?

System.Assert accepts two parameters, one (mandatory) which is the condition to test for and the other a message (optional) to display should that condition be false.
System.AssertEquals and System.AssertNotEquals both accept three parameters; the first two (mandatory) are the variables that will be tested for in/equality and the third (optional) is the message to display if the assert results in false.

@tiny fishing while both methods are used for asserting expected outcomes in tests,
`System.assert()` is used for general boolean conditions, and `System.assertEquals()` is specifically for comparing values for equality. Choosing the appropriate method depends on what exactly you are testing in your Apex unit tests.