Acids provide H+ ions in water, while bases provide OH- ions. Examples of acids include HCl and H2SO4, while examples of bases include NaOH and KOH. When acids and bases react, they undergo a neutralization reaction producing water and a salt. For example, HCl + NaOH produces H2O + NaCl. Strong acids and bases fully dissociate in water, while weak ones only partially dissociate.