"You are searching."
There are some verbs, where the root of the verb ends in s, sz, z (or dz)
For example, keres, eszik, iszik, főz, olvas
For these verbs, the second person (te) form ends with l. We can imagine that adding an -sz would be unpronounceable.
keresel - you are searching
eszel - you are eating
iszol - you are drinking
főzöl - you are cooking
olvasol - you are reading