Ainthinai Aimpathu contains fifty poems written by the poet Māṟaṉ Poṟaiyaṉār.
The poems of, Ainthinai Aimpathu, deal with the agam (internal) subjects.
Agam in the Sangam literature denotes the subject matters that deal with the intangibles of life such as human emotions, love, separation, lovers' quarrels, etc.
The poems of Ainthinai Aimpathu are categories into ten poems for each of the five thinai, or landscape of Sangam poetry and describe in detail the situation and emotions specific to each landscape.
The five landscapes of Sangam poetry are mullai – forest, kurinji – mountains, marutham – farmland, paalai – arid land and neithal – seashore.