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An acid/base definition that suggests an Brønsted–Lowry acid is any molecule that can donate a proton, and a Brønsted–Lowry base is any molecule that accepts the proton. Protons can be referred to as H+ or "hydrogen ions," so if you see those terms used in a textbook they all mean the same thing. When a Brønsted–Lowry acid gives its proton away, it is "deprotonated" and can now accept a proton; now that it has become an acceptor, it is referred to as a conjugate base. The same rule applies to Brønsted–Lowry bases: once they gain a proton (are protonated), they are known as conjugate acids.
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