  Heart disorder has just overtaken cancer as the world's biggest cause of
mortality. Several cardiac failures, heart disease mortality, and diagnostic
costs can all be reduced with early identification and treatment. Medical data
is collected in large quantities by the healthcare industry, but it is not well
mined. The discovery of previously unknown patterns and connections in this
information can help with an improved decision when it comes to forecasting
heart disorder risk. In the proposed study, we constructed an ML-based
diagnostic system for heart illness forecasting, using a heart disorder
dataset. We used data preprocessing techniques like outlier detection and
removal, checking and removing missing entries, feature normalization,
cross-validation, nine classification algorithms like RF, MLP, KNN, ETC, XGB,
SVC, ADB, DT, and GBM, and eight classifier measuring performance metrics like
ramification accuracy, precision, F1 score, specificity, ROC, sensitivity,
log-loss, and Matthews' correlation coefficient, as well as eight
classification performance evaluations. Our method can easily differentiate
between people who have cardiac disease and those are normal. Receiver
optimistic curves and also the region under the curves were determined by every
classifier. Most of the classifiers, pretreatment strategies, validation
methods, and performance assessment metrics for classification models have been
discussed in this study. The performance of the proposed scheme has been
confirmed, utilizing all of its capabilities. In this work, the impact of
clinical decision support systems was evaluated using a stacked ensemble
approach that included these nine algorithms
