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Phylogenetics is the study of evolutionary relationships between biological entities - often species, individuals, or genes. We can reconstruct phylogenetic trees by looking at nucleotide or protein sequences and combining them with our understanding of sequence evolution, which is described using the evolutionary model. This allows us to infer evolutionary events that happened in the past, and also provides more information about the evolutionary processes that operate in sequence. The result of such an analysis is phylogeny (also known as phylogenetic trees) —a hypothetical relationship diagram that reflects the evolutionary history of a group of organisms. Phylogenetics is a field of research that deals with finding genetic connections and relationships between species. The basic idea is to compare the specific characteristics (features) of species, under the natural assumption that similar species (ie, species with the same character) are genetically close. The term phylogeny refers to these relationships, usually presented as phylogenetic trees. Classical phylogenetics deals mainly with physical, or morphological, features - size, color, number of legs, etc. Modern phylogeny uses information extracted from genetic material - primarily DNA and protein sequences. The characters used are usually DNA or protein sites (the site means a single position in a sequence) after aligning several such sequences, and only use blocks that are conserved in all species examined.