**3. Conclusion**

At the beginning, the metagenomic workflow was complicated that it requires many steps, sophisticated equipment, and qualified technicians to perform. Likewise, it was very expensive that not all scientists or laboratories were able to afford its cost. However, nowadays, due to the presence of many different competing companies and laboratories that led to the development of more efficient sequencing approaches, the metagenomic workflow became easier. It is easy now to study and identify organisms directly from their habitats without prior preparations. In terms of cost, NGS is also much cheaper, and with the appearance of thirdgeneration sequencing approaches, it is not required to conduct sample sequencing. Surprisingly, sequencing can be carried out in the field by utilizing a pocket-size portable sequencer. The advancements in the field of metagenomics are amazing, and it became easier, cheaper, and faster.
