Data frame can contain heterogeneous inputs while a matrix cannot. In matrixonly similar data types can be stored whereas in a data frame there can bedifferent data types like characters, integers or other data frames.

rbind () function can be used add datasets in R language provided the columnsin the datasets should be same.

Factor variables are categorical variables that hold either string or numericvalues. Factor variables are used in various types of graphics and particularlyfor statistical modelling where the correct number of degrees of freedom isassigned to them.

8TB is the memory limit for 64-bit system memory and 3GB is the limit for32-bit system memory.

K-Nearest Neighbour is one of the simplest machine learning classificationalgorithms that is a subset of supervised learning based on lazy learning. Inthis algorithm the function is approximated locally and any computations aredeferred until classification.