What exactly are lewis acids and lewis bases?

Lewis acid are substance that contain H⁺ ion

for example;  

H₂o ⇒ H⁺ +  O₂

Lewis base are substance that contains OH⁻ ion

for example

NaOH ⇒ Na⁺  +  OH⁻

Lewis acid is  any substance, such as the H+ ion, that can accept a pair of nonbonding electrons. In other words, a Lewis acid is an electron-pair acceptor. e.g NH4+ and H3O.

A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons. A Lewis base is therefore an electron-pair donor. e.g Water (H2O)

Rain.

I finished the Future Diary im so sad seeing Yuki and Yuno for the last time. Im listening to the saddest song in the OST called "Here with you" im literally crying D: