The major components of the lymphatic system are the thymus, spleen, and the lymph nodes.
The thymus serves as the site where T-cells, one of our immune cells, mature thus the name T-cell(thymus-cell).
The spleen is the organ where blood is filtered. It is also like a reserve for some of the body's immune cells like monocytes and leukocytes.
The lymph nodes are like miniature spleens distributed all throughout the body. They store B, T, and other immune cells, and they trap foreign particles and also filter the lymph that passes through them.