from Sputnik News:
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4+ generation typically means upgraded armaments, onboard avionics equipment, radar, etc. while 4++ denotes the incorporation of weapons and systems that could be found on a fifth-generation aircraft.
Made by the Sukhoi Design Bureau, the single-seat Su-35S is a modernization of the T-10 – the platform on which the Su-27 all-weather supersonic heavy multirole fourth-generation fighter was built;
The Su-35S made its maiden flight in 2008 and entered service with the Russian Army in 2014;
It features a high-precision phased antenna array radar with a range of over 400 km and maximum deflection angle of up to 120 degrees, onboard electronic warfare equipment, and two optional outboard fuel tanks which increase the aircraft’s maximum range from 3,600 km (2,236 miles) to 4,500 km (2,796 miles);
The plane, which has a top speed of up to 2,500 km (1,553 miles) per hour, features an onboard computer allowing the jet to detect and target up to four ground or 30 air targets, and engage between two and eight targets simultaneously, depending on the missile used;
The aircraft can carry a wide array of short-, medium- and long-range air-to-air missiles. It can also be equipped with air-to-ground and anti-ship missiles and both precision-guided and unguided bombs, allowing the Su-35S to attack naval and ground targets;
The plane exceeds its Western analogs, such as the Eurofighter Typhoon and the US-made F-16C Block 50/52 in terms of maximum speed at altitude (M2.25 versus M2 in both cases).