Suppose I have two drugs A and B. B is a new drug that has to be introduced in the market.

Null Hypothesis: Drug A and B are both equal.

Alternate Hypothesis: Drug B is better than Drug A.

If I set my level of significance to let's say 5%. what does that really mean in terms of layman language?

Suppose I have two drugs; A and B. B is a new drug that has to be introduced in the market.

$H_o\text{: Drug A and B are both equal}$

$H_a\text{: Drug B is better than Drug A}$

If I set my level of significance to let's say 5% $(\alpha=0.05)$. What does that really mean in terms of layman language?