What is an Ijazah, what are its types, how is the eligibility of the holder of an Ijazah to teach proven, what are the conditions for a valid Ijazah, do Salafis deal with it or is it a Sufi method, and did Al-Albani possess an Ijazah?

"Ijazah" is a scholarly term coined by Islamic scholars to authenticate knowledge at the beginning of the era of narration. It is a permission to narrate and participate in the scholarly arena, but it is not linked to the extent of the licensee's knowledge. The concept of ijazah has evolved throughout history, from permission to narrate reports to a certified endorsement from a credible authority. Today, it is regulated by laws and systems and overseen by accredited bodies. As for ijazaat that do not verify the competency of the licensee, they are relied upon only for seeking blessings.