Samadhi , the word often get confused with many pre-mordial scriptural knowledge and ideologies. But indeed it's the simplest & easiest state of every form if one understands the basis of samadhi. Samadhi is the simplest state of being aloof from materialistic debris where the pure consciousness merges with the supreme consciousness. When you are in samadhi you become the source itself and harness the flow of divine essence all around. The soul is encircled with many karmic layers in different consciousness levels. Burning away all thoses karmic debris to regain the state of your supreme bliss is all about attaining samadhi.
Samadhis are basically of two types-SAVIKALP & NIRVIKALP SAMADHI
In savikalp samadhi, the devotee's consciousness merges with the cosmic spirit but remains in the initial state of god-contact.
As he progressess he starts to maintain the comunion with the cosmic spirit even in the midst of exacting wordly duties,the state called as nirvikalp samadhi. In this state he does not need to maintain the focus of his own eternal self, he is always in that state no matter how much distraction he faces. Regardless of all the motions of universe he gets completely merged in his own blissful state. The devotee then does not feel like doing any activity but feel the thread of comunion with god making him doing every activity according to the divine will. The veil of non-duality drops and the unity is bestowed among all the creatures. Samadhi turns you out to what you are to realise what you are ... :)