Epistemology is the study of knowledge and justified belief.
As the study of knowledge, epistemology is concerned with the following questions:
What are the necessary and sufficient conditions of knowledge?
What are its sources?
What is its structure, and what are its limits?
As the study of justified belief, epistemology aims to answer questions such as: How we are to understand the concept of justification? What makes justified beliefs justified? Is justification internal or external to one's own mind? Understood more broadly, epistemology is about issues having to do with the creation and dissemination of knowledge in particular areas of inquiry.
Beliefs arise in people for a wide variety of causes. Among them, we must list psychological factors such as desires, emotional needs, prejudice, and biases of various kinds.
Obviously, when beliefs originate in sources like these, they don't qualify as knowledge even if true. For true beliefs to count as knowledge, it is necessary that they originate in sources we have good reason to consider reliable. These are perception, introspection, memory, reason, and testimony.
Example-religious epistemology; central issue for religious epistemology is raised by evidentialism. According to evidentialism, knowledge requires adequate evidence. However, there does not seem to be any adequate evidence of God's existence. Is it possible, then, for theists to endorse evidentialism?
To bring epistemology on the right path, it must be made a part of the natural sciences and become cognitive psychology.
The aim of naturalistic epistemology thus understood is to replace traditional epistemology with an altogether new and redefined project.
According to a moderate version of naturalistic epistemology, one primary task of epistemology is to identify how knowledge and justification are anchored in the natural world, just as it is the purpose of physics to explain phenomena like heat and cold, or thunder and lightning in terms of properties of the natural world.
The pursuit of this task does not require of its proponents to replace traditional epistemology. Rather, this moderate approach accepts the need for cooperation between traditional conceptual analysis and empirical methods.
since many view scientific facts as social constructions, they would deny that the goal of our intellectual and scientific activities is to find facts. Such constructivism, if weak, asserts the epistemological claim that scientific theories are laden with social, cultural, and historical presuppositions and biases; if strong, it asserts the metaphysical claim that truth and reality are themselves socially constructed.
A success may temporarily establish claims that 'epistemological' path of understanding is outside the 'philosophical' domain but its a weak argument of scientificity and saying that scientific or any particular way is outside the domain of further conjectures/experience/variety of sources being synthesized in human mind.