Let $(X,d)$ be a \reftext{def:metric-space-2026a}{metric space}. We say that $(X,d)$ is complete if every \reftext{def:cauchy-sequence-metric-space-2026a}{Cauchy sequence} in $(X,d)$ \reftext{def:convergent-sequence-metric-space-2026a}{converges} to a point of $X$.