The idea of 2021 LISBON 26th International conference on Innovations in “Science, Engineering and Technology” (LISET-21) scheduled on May 18-20, 2021 at Lisbon (Portugal) is for the researchers, scientists, scholars, engineers and parctitioners from all around the world to present and share ongoing research activities. This conference provides opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration.