What is the meaning of idgham?

Idgham is an Arabic term used in Tajweed, which refers to the merging or blending of two letters, particularly when pronouncing certain letters in the Quran. It typically occurs when a letter with a sukoon (no vowel) precedes a letter with a vowel, leading to a smoother transition in pronunciation. There are specific rules and types of idgham, such as idgham with ghunnah (nasal sound) and without ghunnah. This practice enhances the fluidity and beauty of recitation in the Quran.